Changing to PoS or hybrid would require a hard fork. All proposing a change to PoW or the 21 million total cap would do is piss off holders. Investors have been upset enough with the hard fork wars. What bitcoin needs is stability and less strife if we want to see price over $500 this year. Arguing for a change to PoS was a tactic luke-jr used to scare miners from changing from Core to Classic.