Well yes, but Six Flags is a much more catchy name than mid-america
I broadly agree with @Mushroom that the community way overstates the headwinds to rebranding things, but I also agree with you here @coasters_bgw in that picking a really bad name (which, I do certainly believe "Mid-America by Enchanted Parks" is), will make the transition a lot rockier.
"Mid-America by Enchanted Parks" is a mouthful, you can't actually abbreviate it without changing the meaning completely, no one knows what Enchanted Parks is to begin with (making it a useless tagline on an already completely nondescript title), "Mid-America" is a geographic region of the United States, not an amusement park, there's nothing specifically St. Louis in the name, it does nothing to evoke fun or thrill or wonder—there's just... a whole lot wrong with the name.
If I want to be particularly prickly about it, frankly, I think it's pretty astonishing that the CEO of this new park chain would just go to a local paper within days of buying the park and announce a name off the cuff like this. Shouldn't he get to know the place a bit? Maybe spend some time sitting down with park-level management? Maybe run a local St. Louis focus group to market test some rebranding ideas? It just all feels incredibly slapdash and, dare I say, myopic? Don't know, the vibes are weird. The almost-certainly-AI-generated corporate logo doesn't help either.