The problem, of course, is that there really wasn't any other choices except Jamie. The throne of Avalon had to be "legitimate" and that meant either a member of the Braddock family or Arthur himself. And, well, you saw how Arthur is now.

We haven't seen Avalon being mined for resources or taxed or had any undue burdens placed upon it. Germany post-WW II had all of those things.

Heck, we haven't even seen more than one or two mutants move to Otherworld. (Just one, to my recollection.)