The only park on that list I see being bought up by someone is Silverwood, and that would be by Cedar Fair. Aftershock might be the only thing that makes it look more like a corporate park on the skyline. They have a lot of good planters and Cedar Fair will keep up with this, and maintaining the two woodies. They have 2 steel coasters, the two woodies, an SBF spinner, and an old kiddie coaster. Maybe they could get Time Warp from Wonderland and a launched coaster, that would round the park well.
Castles and Coasters is too small to be much more, Palace might snag it if it falls on hard times-but that's unlikely.
Lagoon is doing fine as they are and will remain on the trajectory they are on.
Cedar Fair doesn't have property in New England, but Funtown Splashtown doesn't look to be in a shape that would make sense as a corporate park.
Camden Park and Beach Bend are a similar story to Funtown Splashtown and Castles and Coasters: too small and doesn't look the part.
Adventureland does look like a Six Flags park as it doesn't look that beautiful, but I feel the water park if they remove their skycoaster and the ride that looks like Penguin's Blizzard River at Six Flags America (not sure of the model) would work out for them. It's halfway between Worlds of Fun and Valleyfair. Nearest Six Flags is six hours away so this might be accurate.
Fun Spot: HELL NO, those will stay as they are for a long time
Waldameer is a lot like Knoebles, so no. They might condense their pavilions to the air between the East Side and West Side and put another coaster next to Steel Dragon where the Rainbow Gardens building is, but that is at least 10-15 years away.