Lol, very true.
As far as I understand it, American Adventure was always a flawed site for a big theme park and could only serve a certain regional audience, which was never going to fully support its long term future, plus a spate of mismanagement. It was good while it lasted but wasn't going to last, a product of a time when it was less costly to build theme parks and people were more ready to get out to have some casual fun, without needing to blow your socks off.
I never went but looked like it had some fun to offer. The petition is embarassing and probably rose-tinted, but at least nice that people care. Hopefully no more regional UK parks go the same way, because we're never going to get any new ones pop up now.