Proof of stake is capitalist.
Voting is never capitalist.
Stakeholders own means of production, in their stakes.
Voters own the means to have their wealth siphoned away in the inexorable powerlaw distribution of wealth.
Money is not a corporation.
It is also true that proof-of-work is convergent (or divergent depending on your basis expectation) on the powerlaw of distribution of wealth.
How do we remove wealth from a decentralized consensus protocol
Powerlaw distribution of wealth in cryptocoins is a non issue. Wealth will be distributed and re-distributed many times for the simple reason that code can be cloned unlike material wealth like gold. You don't expect in the future one global ledger, one world currency like most nerds here, do you?
Bitcoin is not backed by electrical power consumed to produce blocks, its idea can be copied and re-implemented. Its value is based on faith, we're watching some of this faith evaporating now to competition. Competition is code as well and wealth will be re-distributed to better competition, and so on, ad nauseam.