Well so far it's impacted the industry by showing parks what happens when you're too ambitious ...
I agree that it could seriously hurt Chessington. In fact, I'd go as far as to say it could be the death of the park. It would be very difficult for long-distance visitors to justify going to Chessington when a park that caters to the same audience but does it infinitely better is just an hour away (and, in most cases, an hour closer).
I think Legoland would still be able to compete (much like Legoland Florida is able to compete with the high-level parks), although some game-upping would be necessary.
This could also hurt some smaller family parks in the south, such as Paultons Park and Adventure Island.
Rides on Dragon's Fury since SRQ installed:
2016: 17 | 2017: 35