No Vatican approved trad priest ordination has ever been performed by an old consecration rite bishop, all the consecrating bishops were consecrated by the new formula. In all of those years, since 1988, there were plenty of old formula bishops around to do the ordinations, yet not a one was used. That was always a clear sign to me that it was planned that way. Now, the new SSPX bishops are to be ordained by a new rite bishop too?
I think this was being done on purpose too. So, for instance, most of the Novus Ordo Mass translations likely invalidated the consecration with the "for all" translation (as appeared in the vast majority of vernacular versions). Then a couple years ago they finally brought back the "for many". Why, suddenly? Well, I theorize that it's because by that time very very few priests remained active who had been ordained in the Old Rite. So now that the Holy Orders has been invalidated, they stopped caring about the actual Rite of Mass anymore.
See, there are two philosphies regarding the origins of this crisis. One is that it just developed organically due to a gradual loss of faith in the hierarchy. Another is that it was a planned demolition put deliberately into play by the Church's enemies. While it's certainly a combination of the two, I believe it to be primarily the latter, and I believe that they are still in control and still actively guiding their demolition. I don't believe in the "auto-demolition" thesis. With Our Lord, I say, "an enemy hath done this." This is key, because, if you believe the latter, as I do, there can be NO QUESTION of any kind of unification talks until these enemies have been uprooted and eliminated.