If Nvidia can making gaming cards that nerf mining without any loss in gaming performance then they defiantly should.  but people are still going to be mad they are devoting resources to the mining cards that could be going into the gaming cards, if they are planing on making a separate mining line.
  
Ethereum is where it does get pretty interesting.  So the POS model is going to roll out in a hybridized model, probably to avoid forking, where the first 99 out of 100 blocks are POW and the last block is POS.  People holding enough Ethereum to stake it are going to be making money off of the stake amount so anyone mining it and staking it will get even more.  i think the idea is to incremently make more blocks POS and less POW until there are no more POW blocks left.  However, there is also the difficulty bomb/ice age that seems to be ramping up the difficulty right now leaving all the small time miners in the dust.  Making it only profitable for the mining farms to stay in the game.  This is probably why people are suspecting Samsung of making ASIC  miner chips, paired with there ram, that will make Ether Asics that will be able to hash the higher difficulty.  It is going to continue being a roller coaster and as of now we can only speculate what will happen.