This is great news for the UK Park industry. If there is a Doctor Who ride there, then I think it a lot of people from the States who flock over to Britain to ride it. Americans love Doctor Who like Brits love Harry Potter or The Simpsons. Even combine this with Paramount's own IPs like Star Trek, I think the selection of IPs will be a really good choice.
This also gives Merlin a good kick up the backside, Especially for Thorpe. If the park is still like how it is in 6 years time, why on Earth would I want to visit there when I can go to the Paramount Park which would be more in shape? Towers wouldn't be affected as much, but it still needs a makeover badly. As for Chessie, I can't see the park operating in 10 years time if I'm honest, but maybe that's for the better.