And who's to say that Tara or Talerium won't one day 'pull a Darka'? Or that Cagil won't just pick a fight with one of their allies? This is BattleMaster after all and Atamara's big realms won't hang on to all those many nobles of theirs if they let peace settle in.
A year or more ago I heard the same argument from Silverfire, to whom I made a promise to eat my hat if anything like this ever happens. You can see how his opinion has changed in that time.
Again, I'll be the first to admit I was wrong if it happens, but count me a skeptic.
