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
I don`t sure about miners. The profit will decrease seriously but i dont think that miners will left. It was 2019, then i thought that i can stop mining, because electricity bills became more then profit. But i optimized my energy consumption and continued mining.