The Quentin Blake art style would be very interesting converted into a real world 3D version. His illustrations are instantly recognisable and familiar across generations, which could give CCL the right feel for an wide appeal area (ages 5 and up) that Alton are lacking.
Unfortunately I've never ridden the chocolate factory ride, so I don't know how that was (sure I've read it wasn't great), another try at a book illustrated by Blake might be a chance to do justice to the style.
With Walliams books, I can imagine a bank robbery would make a good action packed dark ride. His other titles seem more difficult to convert to rides, though I'm sure it's possible with a little creativity and knowledge of the books (I've not read any of them!).