Today Net Hashrate
ETH : 600 TH/s ~ 20.000.000 RX 570 8G
RVN : 5 TH/s ~ 384.615 RX 570 8G
ERG : 15 TH/s ~230.769 RX 570 8G
If ETH go to PoS, you will see all PoW coins become unprofitable. And 60-70% miners will left
And why would they all of a sudden become unprofitable? Care to explain yourself?