All of this story tell us something.
We now know that someone out there is able to crack aprox. 2^50 private keys in about 1 year.
(in a worst case scenario, also assuming that the one who cracked the 50 addresses brute forced all the possible addresses sequential)
As time goes by this capability will increase, it may take decades and decades or centuries but eventually it will be possible to crack 2^256 pvks.
The transaction referenced in this thread is a good reference to test how far the mankind cracking capabilities are.
As of now, we can enjoy the safety of bitcoin for a long long time
2^1 2
2^2 4
2^3 8
2^4 16
2^5 32
2^6 64
2^7 128
2^8 256
2^9 512
2^10 1024
2^11 2048
2^12 4096
2^13 8192
2^14 16384
2^15 32768
2^16 65536
2^17 131072
2^18 262144
2^19 524288
2^20 1048576
2^21 2097152
2^22 4194304
2^23 8388608
2^24 16777216
2^25 33554432
2^26 67108864
2^27 134217728
2^28 268435456
2^29 536870912
2^30 1073741824
2^31 2147483648
2^32 4294967296
2^33 8589934592
2^34 17179869184
2^35 34359738368
2^36 68719476736
2^37 137438953472
2^38 274877906944
2^39 549755813888
2^40 1099511627776
2^41 2199023255552
2^42 4398046511104
2^43 8796093022208
2^44 17592186044416
2^45 35184372088832
2^46 70368744177664
2^47 140737488355328
2^48 281474976710656
2^49 562949953421312
2^50 1125899906842620 <- This is aprox. the number of bitcoins private keys someone is able to crack in about 1 year
2^51 2251799813685250
2^52 4503599627370500
2^53 9007199254740990
2^54 18014398509482000
2^55 36028797018964000
2^56 72057594037927900
2^57 144115188075856000
2^58 288230376151712000
2^59 576460752303423000
2^60 1152921504606850000
2^61 2305843009213690000
2^62 4611686018427390000
2^63 9223372036854780000
2^64 18446744073709600000
2^65 36893488147419100000
2^66 73786976294838200000
2^67 147573952589676000000
2^68 295147905179353000000
2^69 590295810358706000000
2^70 1180591620717410000000
2^71 2361183241434820000000
2^72 4722366482869650000000
2^73 9444732965739290000000
2^74 18889465931478600000000
2^75 37778931862957200000000
2^76 75557863725914300000000
2^77 151115727451829000000000
2^78 302231454903657000000000
2^79 604462909807315000000000
2^80 1208925819614630000000000
2^81 2417851639229260000000000
2^82 4835703278458520000000000
2^83 9671406556917030000000000
2^84 19342813113834100000000000
2^85 38685626227668100000000000
2^86 77371252455336300000000000
2^87 154742504910673000000000000
2^88 309485009821345000000000000
2^89 618970019642690000000000000
2^90 1237940039285380000000000000
2^91 2475880078570760000000000000
2^92 4951760157141520000000000000
2^93 9903520314283040000000000000
2^94 19807040628566100000000000000
2^95 39614081257132200000000000000
2^96 79228162514264300000000000000
2^97 158456325028529000000000000000
2^98 316912650057057000000000000000
2^99 633825300114115000000000000000
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2^103 10141204801825800000000000000000
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2^197 200867255532374000000000000000000000000000000000000000000000
2^198 401734511064748000000000000000000000000000000000000000000000
2^199 803469022129495000000000000000000000000000000000000000000000
2^200 1606938044258990000000000000000000000000000000000000000000000
2^201 3213876088517980000000000000000000000000000000000000000000000
2^202 6427752177035960000000000000000000000000000000000000000000000
2^203 12855504354071900000000000000000000000000000000000000000000000
2^204 25711008708143800000000000000000000000000000000000000000000000
2^205 51422017416287700000000000000000000000000000000000000000000000
2^206 102844034832575000000000000000000000000000000000000000000000000
2^207 205688069665151000000000000000000000000000000000000000000000000
2^208 411376139330302000000000000000000000000000000000000000000000000
2^209 822752278660603000000000000000000000000000000000000000000000000
2^210 1645504557321210000000000000000000000000000000000000000000000000
2^211 3291009114642410000000000000000000000000000000000000000000000000
2^212 6582018229284820000000000000000000000000000000000000000000000000
2^213 13164036458569600000000000000000000000000000000000000000000000000
2^214 26328072917139300000000000000000000000000000000000000000000000000
2^215 52656145834278600000000000000000000000000000000000000000000000000
2^216 105312291668557000000000000000000000000000000000000000000000000000
2^217 210624583337114000000000000000000000000000000000000000000000000000
2^218 421249166674229000000000000000000000000000000000000000000000000000
2^219 842498333348457000000000000000000000000000000000000000000000000000
2^220 1684996666696910000000000000000000000000000000000000000000000000000
2^221 3369993333393830000000000000000000000000000000000000000000000000000
2^222 6739986666787660000000000000000000000000000000000000000000000000000
2^223 13479973333575300000000000000000000000000000000000000000000000000000
2^224 26959946667150600000000000000000000000000000000000000000000000000000
2^225 53919893334301300000000000000000000000000000000000000000000000000000
2^226 107839786668603000000000000000000000000000000000000000000000000000000
2^227 215679573337205000000000000000000000000000000000000000000000000000000
2^228 431359146674410000000000000000000000000000000000000000000000000000000
2^229 862718293348820000000000000000000000000000000000000000000000000000000
2^230 1725436586697640000000000000000000000000000000000000000000000000000000
2^231 3450873173395280000000000000000000000000000000000000000000000000000000
2^232 6901746346790560000000000000000000000000000000000000000000000000000000
2^233 13803492693581100000000000000000000000000000000000000000000000000000000
2^234 27606985387162300000000000000000000000000000000000000000000000000000000
2^235 55213970774324500000000000000000000000000000000000000000000000000000000
2^236 110427941548649000000000000000000000000000000000000000000000000000000000
2^237 220855883097298000000000000000000000000000000000000000000000000000000000
2^238 441711766194596000000000000000000000000000000000000000000000000000000000
2^239 883423532389192000000000000000000000000000000000000000000000000000000000
2^240 1766847064778380000000000000000000000000000000000000000000000000000000000
2^241 3533694129556770000000000000000000000000000000000000000000000000000000000
2^242 7067388259113540000000000000000000000000000000000000000000000000000000000
2^243 14134776518227100000000000000000000000000000000000000000000000000000000000
2^244 28269553036454100000000000000000000000000000000000000000000000000000000000
2^245 56539106072908300000000000000000000000000000000000000000000000000000000000
2^246 113078212145817000000000000000000000000000000000000000000000000000000000000
2^247 226156424291633000000000000000000000000000000000000000000000000000000000000
2^248 452312848583266000000000000000000000000000000000000000000000000000000000000
2^249 904625697166533000000000000000000000000000000000000000000000000000000000000
2^250 1809251394333070000000000000000000000000000000000000000000000000000000000000
2^251 3618502788666130000000000000000000000000000000000000000000000000000000000000
2^252 7237005577332260000000000000000000000000000000000000000000000000000000000000
2^253 14474011154664500000000000000000000000000000000000000000000000000000000000000
2^254 28948022309329000000000000000000000000000000000000000000000000000000000000000
2^255 57896044618658100000000000000000000000000000000000000000000000000000000000000
2^256 115792089237316000000000000000000000000000000000000000000000000000000000000000 <- And this is how safe bitcoin is.