That and the fact that they have many rural regions in between Fatmilak and Madina, plus their refit time will be longer.. so yeah, if the Tower falls, Madina is screwed. We managed to take down their stronghold walls, but we won't be back for another month or two.
What's needed to buy a region again? Other than loads of gold?
'cause if it's just gold, it would totally be a worthwhile investment for Aurvandil...