Not really.
I mean, let's use your 'ENT was bound by TOS' example. If B&B had liked, they very well could have had the Xindi win the war and blow-up Earth into chunks of rock. They could have decided to decanonize TOS, or used story devices to 'explain' why TOS was no longer being considered.
Or they could have done it, never given an explanation either way, and left it for fans to wank themselves an explanation ('Humans had recolonised another planet and called it Earth.')
Setting tends to hinge on the story the writer wants to tell, not the other way around. George Lucas (presumably) didn't sit and say 'I want to do a movie set in A-Time- Not-Quiet-As-Long-Ago'. I'm going to take a guess and say the thought process went something like: 'I want to make movies about how Darth Vader became Darth Vader' There are exceptions, but that's usually stuff like 'historicals'.