Once you control 50%+1 of the votes, you vote for forks that give you equal or more voting power.
Except nobody has done this yet. Other than that, you're mostly right

In theory you can do a lot of things.
Do you think this frivolous answer addresses the fundamental problem? This is why people find PoS supporters so tiresome.
Do you think billion dollar companies are going to put their weight behind "nobody has done this yet"?
Maybe if you said, "We're a centralized cryptocurrency run by technocratic overlords, if our currency does something wrong, we'll unilaterally modify it. If you don't like it, you can suck our balls." we would be less critical of you.