Never.
For following reasons:
The Proof-of-Work consensus algorithm was developed to prevent:
Attacks using computing power
Fake records
Refusals to carry out transactions
Spam

Sure.

Bitcoin will be forced to evolve,
After

1. Bans of PoW mining increases World Wide
2. PoS coins (Ethereum & Cardano) takes the #1 position away from it on CMK.

PoW was always a failed design due to energy waste,
which is why PoS was created all way back in 2013 to solve the energy waste issue.

Ethereum Devs are wise enough to evolve by choice.
Cardano is already Pure Proof of Stake.

Bitcoin Devs will have to be forced by market conditions and government interference.
Bitcoin Devs are kind-a-slow.


FYI:
All of those whiners that complain PoS will give whales more power, ask them how many bitcoins they have mined this year?
Where as in PoS , anyone can join a pool and earn PoS coins, PoW restricts mining only to the rich elite now.

* Your Grandma can join a PoS pool and earn more PoS coins, where she never be able to mine a PoW Bitcoin. *
So who is keeping bitcoin proof of waste really hurting.

FYI2:
There always a chance that Bitcoin converts to a energy efficient human slave PoW design that uses humans instead of ASICS.
But as the bans get worse, they are going to have to change to something beside ASICS.
PoS is the Good one, and human slave PoW is the evil one.
https://lexpatent.by/en/news/2020/05/14/Microsoft-666/

With PoS, the more coins you hold, the more power you have over the network. Now think of the huge exchanges such as Coinbase and Binance — think about how much power they'd have. Bitcoin with PoS is simply a disaster.

YES.  Bitcoins value will in fact be transferred to a POS energy efficient environmentally sustainable Bitcoin . The Bitcoin Core developers will never go for it .The best thing about decentralization and the value Bitcoin has is the community decides the direction of Bitcoin. Enough people abandon the chain and move to another "That chain becomes Bitcoins value" Bitcoin is doomed to fail in the wake of POW. The huge carbon footprint that comes with bitcoin mining will be its demise. If action is not taken to move Bitcoins value to another chain  people holding Bitcoin will lose everything.

Elon musk is alot of things but the guy is NOT dumb. The world wont stand for wasting energy and unnecessary carbon footprints. Bitcoins carbon footprint in completely avoidable by POS. People will start buying bulk Bitcoin and sending them to "Burn" addresses to remove them from circulation.A receiving chain will validate the Bitcoin is in fact burnt. You are then sent energy efficient environmentally sustainable Bitcoin XYZ . 1 to 1 swap.  Your should read this .If you think as many do.. Bitcoin needs to go POS this will be a good read

Exactly. However, it is important to note that monopoly will exist in most systems, if it is fundamentally based on the virtue of whoever having more resources being in an advantage.

The problem with PoS mainly lies with how it doesn't require consumption of resources during the mining process. If the process doesn't cost the miners any resources, then there is lesser incentives for a miner to be honest. PoW functions with the fact that there is so much resources being consumed during the process and it would undoubtedly cost the miners a lot if they were to try to attack Bitcoin. The resource consumption is what keeps Bitcoin secure, if you can't come to terms with it, you should probably criticize the financial systems around the world for their electrical consumption as well.

So because others have failed, scammed or fallen short... just stop trying to build a better Bitcoin? Your Personal Text suggest never give up.  Your sending mixed signals. What is is? “Be Revolutionary” only when its easy and quit when its hard? To Be Revolutionary when thing work out perfectly and quit when things get complicated or don't go according to plan?

POS is FASTER and just as secure as POW without the wasteful usage of around 110 Terawatt Hours per year. "More than some countries" This is a FACT. I suggest you read about POS 3.0

My solution does not imply you start from scratch . POS 3.0 is Bitcoin. Evolved over a decade of trial and error. The illusion that every other alt is somehow not a child of  Bitcoin boggles the mind. " widely adopted." Many things are widely adopted. Does not make them the best solution. Decentralized consensus will tell us what reigns supreme. Give it time. Logic will overrule nostalgia. Bitcoin will evolve. It 's value will be transferred to another faster more capable vehicle of value. What that vehicle will be will be determined by  decentralized consensus. This value transfer is not  conjecture but is an unavoidable consequence of Bitcoin mining power consumption and general overall lacking in Bitcoin speed/scaling. Elon Musk called the ball on bitcoin.Hes not the RICHEST person on the planet "FACT" cause he is dumb. Like it or not a shift is coming. Will you be on the wrong side of that shift? No one can make you see logic that's on you.

Lets not pretend like Bitcoin is not  " the one man monopoly" as you put it. If you have the most fiat you can buy the MOST Bitcoin. If you have the largest Bitcoin mining operation you generate the most Bitcoin in rewards. This is the way of the world! No amount of decentralization will change that. Bitcoin cannot change ALL of the dynamic of humanity or our society. It has vast potential but human nature is what it is.The one thing we can change is the mechanism the value Bitcoin holds is powered by. Is it powered by SLOW environmentally unsustainable POW core or a environmentally sustainable FASTER POS