This post belongs in altcoin mining section please consider moving it to the right place it belong here
https://bitcointalk.org/index.php?board=160.0 , here is what I think
1. There is no certainty that ETH will abandon PoW
2. We have ravencoin, ergo, alephium, and others that are still profitable to mine but still if bear market comes mining won't be profitable for a while