Just curious, has anyone heard of priests that may have already left? I imagine those that are part of the Society and joined the seminary/were ordained with the idea that it was all peaches and cream with Rome, must now be rethinking their position. I wouldn't think they'd wait till the actual declaration of schism to leave.
Personally I don't expect many to leave, most of the ones that make it through their seminaries are drones who are fiercely loyal to the Society and will follow wherever the wind blows them.