Yes, March 2020 "flash crash" was the event that is most similar to (possible) future economic crash. Standard and Poor 500 fell by ca 1/3 in one month from February 14 to March 14 (from 3400 to 2300) and Bitcoin by ca 1/2 (from 10000 usd to 5000 usd) at the same period.
So we could estimate: If Bitcoin tends to exaggerate S&P 500 crashes (caused by external factors such as economic crisis) by 50% (Bitcoin's -50% is 50% higher than the S&P's 33% loss, or 33* 1.5 = 49.5) then, in an event like 2008/09 with 50%, Bitcoin could fall 75% (50 * 1.5 = 75). That would be very close to the actual bear markets Bitcoin had in the past, like the 2022 bear market with 76% loss. Nothing really "out of the normal".
I acknowledge that such a crash may happen after a period of profit taking, like it happened in the COVID crash (when people were still taking profits from the 2019 intermediate rally which took BTC from $3000 to $14000), and then the crash may be worse and affect the long MAs to the downside.
But I have two arguments which counter this:
1) The COVID crash happened in 2020. Bitcoin was about
double as volatile in the 2020-22 era (2-5%, not counting the COVID spike of 9%) as it is now in 2024+ (1-2.5%).
2) Bitcoin's price is driven by estimations about future adoption as a global currency or store of value asset. This wouldn't change because of an economic crisis as no stock market crash "touches" the fundamental advantages of Bitcoin. This would mean that like in the COVID crash, there would be massive "dip buying" once the price gets really attractive. Only if Bitcoin's fundamentals are changing (e.g. future adoption becomes unlikely for whatever reason, for example the emergence of a type of decentralized money which is better than BTC in every aspect) this would change, but then an economic crash would not change much. I'd think that in this case we would witness the fall much earlier than in the crisis itself.
Its valid to invest but also we still might see the BTC price drop below the 200 week average and people tend not to like being underwater like that.
History until now has shown that every time the BTC price dropped below the 200 week average, it recovered quite quickly. This means: "People" (mostly new investors) may not like being underwater, but "strong hands" do like deep dips and will benefit from them.
Anyway, my point of the OP is a bit different: if you could invest in such long term MAs, you would be almost always make profit. Which makes Bitcoin's long term trend a very reliable "store of value", if you could invest in it.
An interesting model but I believe it's reliant on how Bitcoin performed in the past
Thus lagging behind and may take time to account for recent changes just like CPI's.
The "lagging" has the advantage that it almost erases all the short time swings like CPI changes (which would not influence the long term trend or adoption trend).
What could happen of course is that the fundamentals of Bitcoin change, and the long term trend is still high. Let's say a technology appears that is better than BTC in every aspect, and BTC goes down to close to zero, with the long term MA deflating only slowly. However, if you invested in a "MA product", the MA would still not crash that deep until very late. And there could always be MA buyers even in such a grim situation if there is some hope for Bitcoin to recover, because in this case the MA would eventually grow again.