I've asked this on a Catholic forum before. The reply I got was basically that Antioch had fallen into heresy, and even over-run by Islamic conquest. I suppose when one has fallen into heresy as multiple Eastern Patriarchs have been guilty of, in the Catholic mind.. you can just give it up. At least, that's the way I understood it..
I personally feel that many of our differences are due to a language barrier. St. Maximos the Confessor spoke Latin and Greek fluently and saw through some of the pointless disagreements we have, especially in regards to the Christology of the filioque. When the western and eastern half of the Roman empire split, it was inevitable that we would become something ontologically different altogether. The question in many of our differences, and in regards to Augustinian influence... is one of emphasis in my mind.