It's just very clearly a market they can't reenter once leaving. I'm not saying it won't happen but it would surprise me. Most of PNW already lacks a major amusement park. Silverwood has a huge catchment area, now that Wild Waves is closing the entire state of Washington pretty much just has their state fair, Oregon has Oaks and Enchanted Forest, and without SFDK and CGA, NorCal would just have Gilroy and Santa Cruz. That would leave an immense region without a thrill-focused amusement park. Not impossible, but it'd be a bold move for sure to rid themselves of both properties imo
Granted, almost everything you've said has parallels in my claims about Great Adventure, and everything I'm saying to you has been used as an argument against my (previous and sometimes still ongoing) contention that Great Adventure will be sold. Your concerns are valid, particularly the animals. I think they're a financial drain that leave both SFDK and Great Adventure vulnerable