If we take that graph to be correct, Chessington is currently the 2nd most popular Merlin theme park. If Jumanji alone has been enough to put it in that position for the first time in decades Minecraft could arguably be a real game changer.
Would it though? What's that based on? A mainstream IP like that is always going to fare better near a city, particularly London.
I don't think we should get too bogged down with this alleged £20m figure. I appreciate i'm the one who raised it but we don't have a verification on the claim yet and as mentioned it does seem to contradict the Merlin quotation of an £85m investment.
I feel it's also worth pointing out that Hyperia was under £20m (though of course some will argue that's only half a rollercoaster).
I'd be very surprised if Gold Rush at Drayton was anywhere near that amount and that's probably the closest comparison to what we could be getting.
I definitely think the central location and universal target market is the primary factors in why Chessington was chosen.
Minecraft is an internationally renowned brand and one of the biggest video game franchises which it has sold over 350 million copies.
Mario, Call of Duty, Tetris, Pokémon, Grand Theft Auto are above Minecraft in sales.
It's audience is not just families but a wider range of people including gamers which it'd be smart to pick a near London theme park for this area.
With Alton Towers, it wouldn't be smart to put it in a park in a less connected area without investment in infrastructure both on park, at the resort and with transportation most of all (especially for international tourists which Minecraft would attract).
The area they've chosen has expansion potential with the chance they could go into Land of the Tiger/Tomb Blaster in the future. It was dismissed this time primarily due to the logistics of moving the tigers and the loss of an existing attraction that they couldn't move elsewhere compared to the other attractions which are getting stored ready for moves elsewhere. It doesn't necessarily mean it'll get reused imminently, according to Coasterpedia, Peeking Heights was put in storage - has this found a home or could it be reinstated elsewhere at some point? It's been a while so can imagine it's got moved on by now.
I'd be surprised if £20m covers the entire area with the nature of the IP however hope to be pleasantly surprised.