It makes things a lot easier. The only problem I had when I decided to run off to secondary-world territory was that I needed something special to justify the move, some magic, something 'different' from the real thing. It took me some time to come up with a solution by merging KINGS AND REBELS with another idea about the Lost Realms (the legends that surround places like Ker Ys, Vineta, Avalon). I made those real and the centres of powerful magic before they got swallowed by some big nasty flood. So there's some magic in my world now, some legends and all that fun.

Maybe you can play that trick with your next trilogy. :)