Here's an example: If a change was proposed which would incentivize the miners to authorize it, but wasn't in agreement from the side of the people, what would happen? I guess that the people would split the chain, but if they hadn't enough power to secure it, wouldn't they come to a dead end? Or to change it a little bit, if there were two forks of Bitcoin, wouldn't the people prefer the one that is the most secure?
As long as it wasn't deployed as a User Activated Soft Fork i.e. BIP9 and not BIP8 then the rules (on the main chain, not whatever fork the community decides to make) are enforced as long as a majority of miners are signaling from it.
If it was a User Activated Soft Fork then users can override miners and force a change to consensus rules (which might include removing existing rules).