Ah, Michael, do you really think those saints, martyrs, popes, etc. all saw things the same way? Of course not! The teachings of one generation built on another, sometimes requiring course corrections, sometimes not. It is pure revisionist fantasy to believe that there have been no significant doctrinal changes in the history of the Roman Catholic Church.

And if a future pope decreed Vatican II null and void, assuming I was still around I'd weigh the teaching and decide whether or not I could conscientiously accept it. Which, by the way, is exactly what you are doing vis-à-vis Vatican II.