Is Proof of Work is going to lose popularity compared to Proof of Stake? Ethereum is going to PoS. 
In my opinion this is the biggest mistake they will be making as they do not have any regard for the investors when they determine these things, it is like a kids play, forking and changing the entire protocol every now and then and if they disregard the investors it will not reach anywhere when it comes to the price.Is there going to be a lot of hash (computational) power idle because of shifting to PoS? 
I think that the miners will shift to ETC.