Small scale GPU miners are the most affected here specially for those who live or mining in a country with high electricity cost
Medium scale GPU miners are next to be affected if this bloodbath does not stop.
Many block-chain will become POS or Masternode. At the end, Bitcoin will become the only mineable crypto.
Is there more than one masternode/pos coin in the top 50? Dash is the only one I think. Yes someday Ethereum will go POS but you already knew that when you got in the game. The only coins going POS/Masternodes are complete shitcoins.