Well, CE & realms which they are allied control now 122/197 regions at Atamara.
I disagree that things would become more complicated, i would say they will be less complicated and pretty bored.
But similar situation has happened to Atamara before, when Abington fell. Back then Darka and Eston were counted as allies of CE & Co.
But there was a long, very boring peace time. And now it is kind of even more limiting diplomatic movements. Cause there is always one who is allied with the "Empire" and nobody dares to resist them. If you are small empire friend, you can go to war and big boyz will back you up. If you attack one of the allies of the Empire, you are dead in few weeks after Empire mobilizes its armies. And because everybody is bored, they will jump on gangbangs simply to get some action. So everybody will be uber carefull with their doings.
This will be definately end of "War era" at Atamara for long time. But it is not ended yet. Still not a single word from Coalition about opening discussion with Darka. So there might be few decent battles ahead.. hopefully we wont collapse on first rampage