I, for one, do not think the debate of the future will be fierce at all. Not even slightly.
The "fierce debates" in the distant future amongst theologians, canonists, casuists, &c., will dwell upon what gradation of theological censure certain errors, mistakes, remiss acts, or even outright heretical and schismatical acts, of certain clerics and layfolk would have incurred, &c.
I think most of them will agree that the majority of the traditionalists were earnest and simple-hearted, but there will be disagreements on the particulars regarding "who," "why," "how," "whence" &c.
Obviously, I don't think we are in the end times. According to some of the Fathers, the vacant seats of the apostate Angels must be filled by the elect forechosen by God to have been the object of His predilection and therefore given the graces necessary for the profession and practice of the Catholic faith.
Since even in the "good ol' days" the number of the saved was very small, in our dark and devastated age even less souls cooperate with grace and therefore reprobate themselves to eternal damnation.
It follows that the vacancy of the apostate Angels is not yet near fulfillment, especially since the signs foretelling the imminent end of the world have not been the seen (especially the conversion of the Jews, I don't think that's anywhere near our time, speaking naturally).
So, this is not
the "Great Apostasy." Worse, much worse, is yet to come in the coming centuries...