I agree. I think every person in the western world should be some mixture of angry and afraid of the new Western Roman Empire taking over and absorbing the old Eastern Roman Empire.
(I'm not sure why Hungary, the one right in the middle of it all, isn't, but...)
The problem I have, is everyone joining up under the same banner to do so. If you go to attack, say, Croatia, to link up your Roman Empires, the Seljuks, the Horse Lords, and Britannians shouldn't be raising armies to go help out the Croatian people. Which is what happens. I press my claim on Croatia, and I have this:
That, is stupid.
What I was expecting from coalitions (and what I think should be done) is to have a limitation of scope on how a coalition forms. They should be limited, first, by religion. Pagans and Muslims and Catholics should not be fighting on the same side in this hypothetical war. I also think there should be some geographical limitation to them as well; is Arabia, Scandinavia, or even Britannia going to really care what is happening to this stretch of land inbetween my two landmasses on the Adriatic coast? I really don't think so.