Crypto is Not Politics
That's like saying consensus has nothing to do with consensus. Luckily there is also the market which has its own way of voting on things.
Yes. It is all economics (game theory) after all. The key is that is becomes very impractical to move for such a vote, just as due to Hash equilibrium it is not practical for the nodes to gang up and 51% attack.
The Ethereum miners are preparing for a 51% attack on the block chain, to for it. Maybe 75% of the miners will attend.