But I think that Benedict XVI's plan of making a synthesis of the 1962 Mass and the Novus Ordo Mass might have not been abandoned. If it was, why would the SSPX impose these liturgical innovations? These things were never a custom in the US, as I have read.
I think it's still in the works, but just delayed by one Bishop Richard Williamson. They'll boil the frog since they know it won't be accepted all at once.
So, after
Traditionis Custodes, the bishop of Cleveland didn't immediately act on it. Finally, Rome clamped down and he had to shut down most of the
Motu Masses, apart from one held at a parish that he designated a "shrine" (and two more pending an appeal to Rome, which will be denied). In many of the places that they had
Motu Masses, they're now having Latin NO Masses instead. So, you use Latin, have people kneel for Holy Communion, sing some Gregorian chant, use Anaphora (aka Eucharistic Prayer) I, which is nearly identical to the Tridentine Canon, and 95% of the laity wouldn't even know the difference. They'll come away with the impression, "Well, this NOM isn't as bad as we thought if done right. It's basically the same thing."