I've noted here before --- and keep in mind that this is nothing more than the opinion of what is, at bottom, a highly educated hillbilly with a laptop --- that I have a pet theory, namely, that the "long game" may be to corral as many non-sedevacantist TLM adherents as possible, into an SSPX that becomes united or associated with the FSSP, ICKSP, and similar bodies, and then to propose a personal ordinariate, or even to create a new rite not unlike the Maronites, Melkites, and so on, essentially, a second Roman Rite. Those who resist, both SV and non-SV, could then be painted as either gravely disobedience or (more likely) schismatic. What would happen after that, one can only speculate. Maybe nothing. When you set a humane trap for an animal, it can either end well for the animal, or it can not end well. It depends on what the trapper has in mind.
I'm not sure how much of a "long game" even exists, though, because TC comes across as the desperate "last gasp" of a man who is afraid he is about to die, "guys, I may not make it, before I go, I'm going to throw the entire weight of the papacy against the Tridentine Latin Mass, insofar as I can, I'm going to get rid of it, and make the Novus Ordo the only game in town". It does seem to have been a "rush job" of sorts, in that it has no vacatio legis, it doesn't even mention the SSPX --- a curious omission --- nor Canon 87 of the 1983 CIC:
Can. 87 §1. A diocesan bishop, whenever he judges that it contributes to their spiritual good, is able to dispense the faithful from universal and particular disciplinary laws issued for his territory or his subjects by the supreme authority of the Church. He is not able to dispense, however, from procedural or penal laws nor from those whose dispensation is specially reserved to the Apostolic See or some other authority.
Neither did he specifically mention Quo primum. That is another curious omission. Maybe that was a Rubicon he didn't want to cross, or maybe the Holy Ghost wouldn't permit it. No way to say.