I wrote a blog post that explains the problem with the practicality with Proof of Stake, why Bitcoin will never switch to PoS, and how Bitcoin miners can slow and even reverse climate change. Read it here:
Bitcoin Being Energy Efficient? (no ads, they were not profitable so I got rid of them. I might just introduce a tip address instead.)
be careful
dont be too quick to stroke people to sleep that bitcoin is "too big to fail" that a switch over to PoS is impossible
knowing the 2 mandate tricks of Eth to switch to PoS
1. mandate that a deadline point be made where by difficulty wont follow the blocktime rules but instead just periodically increase and only increase until unmanageable to solve blocks via PoW mining.
2 mandate that on such date PoS validators take over the block confirm process.
now how to push it into happening in bitcoin.. well again look to history. 2 tactics
its not about needing users agreement of user node..s its about the economic nodes of exchanges and merchants to treat a forked coin as the master chain..
the NY agreement of many exchanges in 2017 done this by treating the UAHF mandated activation fork that created a split where there was a segwit flagging chain as the master chain to follow. where the other split became the offshoot altcoin
and ofcourse the code itself to enforce the mandate and the rejection of those not flagging for the mandate.. that was blockstream sponsored devs.
looking at the past both the NY agreement of economic nodes and the code to support the mandated upgrade were both sponsored by DCG.
now imagine if government regulators pushed that scheme to happen in 2017 whereby the mandated upgrade was not segwit but PoS
where by large businesses had to comply under law/regulation, rather than sponsorship/bribe/payment.
dont turn this into a debate about the 2017 events of taking sides.. think about this as protocol risk of events repeating by a malicious actor(regulators) pulling the mandate grenade