How is this appreciably different than the way it already works today? If 90% of the miners want to do whatever, no one's stopping them.
Bitcoin is not a democracy. It is a system of voluntary consensus. Miners are financially motivated to follow the rules and also to enforce those rules upon everyone else that wishes to participate.
You are free to go ahead and fork your own democraticoin at any time. No one can stop you; just as no one can force a change upon the bitcoin network against the will of the participants.
The difference is simple: stupid people don't get to have everyone in society shoulder the weight of their stupidity.
How do we (we = Bitcoin Community) come to "consensus"? I wouldn't say it's a democracy in the sense that every person loosely attached to Bitcoin has precisely "one vote"--that's not how Bitcoin works. But it's not that different either. In reality, each person has a vote that carries a weight in proportion to their influence. If influence accrues to those who are wiser, then the decision of the "influence-weighted majority" will be the best decision IMO.
I would thus argue that the best approach to reaching consensus is to give the people the necessary tools to make expressing their free choice (e.g., BIP101 vs BIP100 vs no increase) as easy as possible. For this reason, I think the OP makes good sense.