I think it will sort out itself. Riombara and Enweil have plenty of history, which may evolve past just Riombara - Enweil. Either Riombara will implode or they will start becoming very meddling with the Northern Realms, there is potential for both possibilities. Riombara's defensive location also allows it to send her armies further up north to be annoying without worries.
All in all, it's theories. Beluaterra hasn't been given enough time to show IF the complaints are true. What I really want to say is: At least give Beluaterra a chance to sort itself out before asking such changes.
