I would agree to your idea. Ethernum 2.0 is doing its work towards PoS, althought that is still in the future (maybe ~1.5 yrs). In the long run, Ethernum might become environmental friendly.
why use a blockchain if you want to rely on governance?
Just use USD.
Very different governance. Not all governance is bad unless you are a hardcore anarchist.
who do you think should govern the reserve currency of the world?