If we did recognize what is actually different and what do we believe about each other that is untrue, I think we could actually reunite. Because of lack/minimal number of dogmatic pronouncements in Orthodoxy, if we just take steps back and disregard Catholic post-schism tradition, we can reunite as Orthodox. If we interpret Catholic doctrine in a way acceptable to Orthodox and they accept our dogmas, we can reunite as Catholics. It’s not black and white, but real union ends like that. If we disregard any tradition or go with indifferentism and “we don’t care what either side believes in, let’s unite” then it would be union where one side is required to profess and believe something contrary to other side, something that is divided inside and can’t survive.
One side clearly is true, otherwise there would be no need to reunite. We simply need to check which one and acknowledge it, while respecting just demands of other side (for example respecting each other’s Theology, Rite, Dignity and validity as well as ability to develop). I simply don’t think there will be reunion where both sides kinda drop their things, that would infuriate everyone who knows a bit about historical theology of either side and would practically create 3 or more Churches, instead of reuniting 2.