There can be no real unity without the Pope, as the Pope is the principle of unity for Catholics ... so I wouldn't hold my breath. +Lefebvre was able to provide a certain amount of unity due to his stature and his character, but it was an artificial unity based on his person. Bishop Williamson realized this, and spoke of it even before +Lefebvre died, and it's one of the reasons he chose not to found his own "organization".