Pian en Luries has 7 regions, had 25 nobles, and now should have 18.
Libero Empire has 10 regions and 16 nobles.
Both Madina and D'Hara have 7 regions and 17 nobles.
Asylon has 6 regions and only 13 nobles.
I really don't think PeL is in any great danger, in comparison with the other realms. It was living a sort of fake golden age that has just ended, but it's hardly on the worst noble/region ratio out there now. It's still better than many. I see no reason why it should have to fall back and lose regions.