If the time ever did come for the Thompsons to give up the park, perhaps something similar to the arrangement Drayton Manor have with the Looping Group, where the Looping Group took over the park but kept some of the family members on board in director-type roles, would work? I know some would bemoan the fact that it would see another family-owned park going corporate, but the Looping Group's tenure at Drayton Manor seems to be doing wonders for the park so far!
Are things really that bad under the Thompsons, though? I know Valhalla is clearly encountering some kind of issues, but they appear to be outside of the park's control with the energy crisis, COVID, Brexit, the Ukraine war etc causing those, and other than that, are things really that much worse than they ever were? Things seemed fine when I last visited in 2019, and the way some are talking, there would have had to have been a pretty drastic decline in 3 years for the park to be matching some of the comments across the internet.
Granted, I haven't been to the park in 3 years and have only ever visited twice in my life, so I don't have an overly up-to-date view of the situation on the ground at Pleasure Beach, but that's just my thought.