Would it be beyond reason or scope for developers of bitcoin to implement a hybrid proof of stake / PoW system? Is it too late to do this? This gives much more security to the chain as it requires both 51% of all coins AND 51% of network hash to be owned by one person or pool.
Interesting solution. Apparently discussed before, for example,
here.
While I have strong faith in Bitcoin and in general in the community, this issue does concern me, especially with the way mining is going. I'm just thinking there has to be a solution, hopefully without requiring a hard fork.