It doesn't matter what you are decentralising or how important it is. You are mistakenly assuming that the "community" is a reliable failsafe when it is actually the most dangerously unreliable failsafe that can possibly be imagined.

Anything you decentralise must have a centralised failsafe in order to be fixed. If you make the centralised failsafe your "decentralised community", you now end up in a situation where a failed system can be easily taken over by malicious actors, or where ignorance in the community leads to disastrous fixes.

On top of that, most failure in a decentralised consensus system comes from malicious or misguided consensus getting a majority, making it all too easy to "claim" that the system has failed when it hasn't. Endless examples of this in politics; one of the basic formulas for any dictator is to invent a problem, claim the opposition is responsible for it, and claim that you must vote for the dictator to solve the problem.

This is easily done with blockchains. Invent the idea that a 51% user or group is malicious, get them forked out of the blockchain, now you have a free pass to take over. Easy peasy.