This thread started off goofy, but it got me thinking "what if".
What if the change in the Creed had been done the right way resulting in no schism. Would the Catholic Church still be in communion with the Orthodox or would a later problem still caused it?
Well, the filioque did not cause a schism when first introduced. The Photian Schism had other causes as well, primarily the Pope of Rome taking umbrage with the uncanonical deposition of St. Ignatius by the emperor and his replacement with Photios, who was a layman at the time. Later, when the filioque appeared in pope's systatic letter in the early 11th century, his name was not entered into the diptychs, but this didn't appear at the time as a schism over filioque. Polemical arguments at the time covered filioque with other things, but communion appears to have continued in large part. The major problem was papal supremacy. But even this wasn't a pressing issue until 1100, when the Crusaders, with no objection from the pope, replaced the Patriarch of Antioch with a Latin after capturing the city.