It doesn't, there are 8 at the top of the Championship before you look abroad. It shows a shocking old boys club mentality. He was sacked by a team below them in the league less than 3 months ago.
I'd be more than happy if we looked abroad, but clubs like ours have a very conservative attitude to recruitment. The boards or technical directors probably don't have much knowledge of overseas leagues, so they go for the tried and tested closer to home.
As far as managers with the top Championship clubs, I wouldn't assume they could all make the step up. You might argue we need someone who knows the Championship, but ideally you'd want someone who could build for the future, not just a short-term fix.
Anyway, let's see what Mark Jenkins comes up with.