If the issue is whether PoS will work is troubling you: other PoS chains like Algorand have been successfully running for well over a year. Seems in no doubt.
And the financial motivation to do this is much greater for ETH since it's around 100 times more liquid than ALGO.
What's more concerning is that Proof of Wealth (which is what Stake really is), is just going to lead to those with biggest balances dictating rules to everyone else. Exactly what happened in EOS, Steem, etc...
It will become a plutocracy with cute emojis.
Three comments repeating the same point are not enough, you should spam this argument some more, maybe then it will make sense.
So if PoW and PoS both suffer the same problem of minority dictating rules to everyone else do you know of any consensus algorithm used in crypto that avoids that problem?