Yes, Norwich is a step up, but that particular step is getting smaller and smaller.
The AMEX will actually hold more than Carrow Road from the start of next season, and of course there's further capacity ( 500, then 3000 ) on it's way.
If Gus is impatient, he could go there, but that would imply he's already planning on moving on again very quickly, and I can't see it's worth his while.