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.
ZEITCOIN , and almost all Proof of Stake coins in 2014 and earlier all started with a month or so of PoW only.
Those coins either dropped PoW completely or stay a hybrid of both.
ZEIT was going to stay a hybrid, however a flaw was discovered running PoW with PoS,
so they just dropped the PoW as it served no real function anymore after the initial birth.
When the ICO craze started in 2015 , is when new PoS coins fazed out all PoW mining even from coin creation.
The input costs to maintain a PoW network continue to grow at an exponential rate.
Bitcoin requires millions of dollars of electricity to feed it's wasteful energy appetite.
Proof of Stake networks can run on an input cost of less than a few $1000 every month, and our input costs are constant verses PoW wanting more every month.
PoS can match PoW performance without requiring millions of money wasted on energy every month.
Which is why Eth is moving toward PoS and dropping PoW,
Bitcoin PoW will just continue to centralizes control until it is no different than Government controlled fiat.
Proof of Stake will outlive Proof of Work.
Because it is sustainable and millions of times more cost efficient.
FYI:
@hv_ you are a bitcoin cash bagholder, so you pointing fingers is silly.