Thorpe Park will see all of the investment IMO due to proximity.
I really fear for Alton Towers by the early 2030's due to a lack of public transport connections and shifting behaviours regarding private vehicle ownership by then once ICE vehicle productions stop and prices, taxes and energy costs increase to reduce private travel and distance driven by car.
I can genuinely forsee a time when rides get relocated from Towers to Thorpe if things don't improve. The next 5 years will be huge for AT to get things right.
Controversial sure, but I do not think the UK market can sustain Universal, Thorpe, Alton Towers, Blackpool Pleasure Beach, Flamingo Land, Chessington, Paultons Park etc.
Economically, removing London, the rest of the UK has a GDP equivalent to Mississippi. We are a poor nation relatively speaking, as hard as that is to admit, and this coming recession will hit very very hard.
The south, with it's higher economic output will survive well i.e Paultons, Thorpe and I do think Drayton Manor for Staffordshire will survive.
Blackpool has a location advantage, but it really needs to draw back in the families visiting the promenade with parity gate price tickets.
Flamingo Land is already more expensive than AT and BPB, I'm not sure how that will cope.
As for Chessington and Lego Land they will be additional benefactors of Universal. I think the kids parks will be fine - but older children, teenagers and thrill seekers will want to visit Universal and Thorpe Park more than anywhere else.
FWIW, if I was Merlin I’d be screaming at the government for the nearby railway at Alton to be reinstated back to CVR and then Leek to Stoke and Chessington to have it extended to closer to their entrance with a new station. Then get the bypass into Alton of Bamfords land finally.
Both easy enough and doable. Should have happened years ago.
Just another example of the country failing to invest in sensible ideas.