Because the vulnerability centralisation of mining creates has been solved by POS crypto-currencies.
Except for first mover advantage Bitcoin is already worthless/obsolete.
Bitcoin can either seriously try and fix the problem now, or be relegated to the dustbowl of history the next time there is a serious double spend attack.
And you are holding how many, and of what type, of coinage?
I'm asking because I wonder if you're full of hot air or actually have your head pulled out.
Bitcoin 70%
NXT (POS) 20%
Bitshares (POS) 5%
Other 5%
Disclosure: I'm not very smart because included in the 'other' camp I also just bought 'Kittehcoin'
Only because I can see a ridiculous Doge vs. Kitteh battle starting next week...