Let me rephrase the question since you seemed to just dismiss it. If you invented a miner that uses almost no electricity and is fairly cheap to produce and nobody else had anything close, what would you do?
If I found a way to mine Bitcoin for very cheap, I would mine the hell out of it. :-) To some extent this is a flaw of the Bitcoin network because sometimes things like this come along; somebody develops a new tech and keeps it to themselves. This to some extent happened when Bitcoin went from CPU to GPU and then again to ASICs. The first ASICs were hoarded. If there is another leap, it will happen again.
The great thing about PoS is you can't really do this.
That's it! But I disagree with your viewpoint here. Competition is the essence of commerce and capitalism. It gives the edge to innovation. PoS is simply a numbers game that is solvable. Once you have a certain level of stake, nobody can take it away. At least with Bitcoin, if someone manages to get control, it can be taken away competitively.
Alphabet altcoins - copy/pasta from >1000 altcoins.
NXT - I'll wait for the next NXT. It's just another altcoin.
NEM - Claims to not be coin, yet claims to be coin. Does that ripple a familiar vibe?
Bitcoin requires work. Why do so many people have a problem with work?