PoS maybe the way for solution but it has to be improved and with secure in mind.
There is no work involved in proof of stake. It's like a perpetual motion machine then(
even more so than it is now), there is no work involved. We need work in order for bitcoin to be fungible and secure. Proof of stake isn't really as secure as you think. Hybrid pow/pos is as retarded.
POW makes the most sense. POS is the same retard concept we have with central banks today. Earning interest, just because you already own something? That doesn't make sense at all, since owning is no productive activity. Proof-of-Resources might be an alternative that at least has some logical merit.
I don't share the concerns that Bitcoin POW might consume too much power. Even if Bitcoin will consume the electricity equivalent of an entire nation it is not necessarily "too much" if you put it into perspective. Bitcoin is both a source of secure monetary units and a transaction system. If you consider the joint energy that is used to provide both functions today (putting physical currency into circulation, maintaining networks of ATM's and transaction servers), Bitcoin will still have a smaller energy footprint.
ya.ya.yo!