I definitely think that proof-of-work is going to be phased out soon, though proof-of-stake isn't much better, they all require specialist hardware in order to run their networks, which is not something we should implement for later generation blockchains, a waste of energy can't be the best way to secure a blockchain. I notice that the major blockchains are starting to shift towards POS as it's definitely more environmentally friendly than POW, but it also increases centralization and the risk of a vector based attack so we should look for even better alternatives in future.
If you see behind the curtain you d notice that only big bag holders are proposing (their) PoS.
I know not a single (reasonable) PoS that started like the original Bitcoin with PoW.
This is also exactly the thing when you try to get SEC compliant. PoS will stay nichy and go away.
DLTs are the best vector to make any pos redundant.