I want to pose this article as a thought experiment. This means I am not trying to argue a point I absolutely agree with, nor drawing any hard conclusions. I am merely following a train of thought to see where it leads and if others agree, and—if not—why.
Let us suppose that after Francis, we were to get a hypothetical Pope Pius XIII who mandates that the Roman rite return to the Tridentine liturgy. The Novus Ordo is suppressed. The TLM becomes the normative Mass across the entire west. Deo gratias.
If that were to happen, the Traditional Mass would then no longer be celebrated exclusively by priests who are devoted to liturgical excellence. Rather, every slip-shod parish priest who was accustomed to carelessly fumbling his way through the Novus Ordo is now saying it. Charismatic priests accustomed to incorporating drums and tongues into Mass are now saying it. Retirement age priests who just don't care and can no longer keep track of the shits they don't give are now having to say it. And most are not saying it out of deep love for that liturgical form, but merely from ecclesiastical dikat.
Furthermore, this is all being overseen by the same crop of bishops who have always exercised minimal interest in the liturgy and are likely, at best, to give the new regime a mere shrugging adherence. And it would be rolled out to the same apathetic Boomer congregations that are ubiquitous throughout the Novus Ordo world today.
What would the Traditional Latin Mass look like in these hands? What would stop it from being improvised? Is there anything inherent in the liturgy that would save it from being mutilated?
As far as I can see, the answer is no. A priest can violate the rubrics of the old Mass just as much as he can the new, the only difference being that the terms upon which he violates the New Mass are much more ambiguous. The integrity of the liturgy ultimately depends upon the integrity of the priest saying it, regardless of the specific liturgy being said.
Now, it could be argued that there was no a widespread problem with liturgical innovation prior to Vatican II, so this is good evidence that the Traditional Latin Mass would never have this problem in the future. While this is true (although I should say it is most true of the period between the Council of Trent and Vatican II), this was due primarily to the formation of the priests in those times. They were formed in such a way that respect for the integrity of the liturgy was paramount and innovation would have been unthinkable. Bishops enforced this, popes safeguarded it, and congregations expected uniformity.
So again, the integrity of the liturgy comes down to the will of the priest saying it. It has been observed that a priest following the rubrics of the TLM fades into the background. He allows the liturgy to glorify God through him, becoming, as an individual, of no importance. This is all true...if the priest follows the rubrics. But for that to happen, you need priests who are disposed to follow the rubrics to begin with. Would we have that if the TLM were suddenly mandated universally?
The point is that bringing back the Traditional Liturgy alone would be insufficient unless it was accompanied by a general spirit of metanoia throughout the entire Church. I understand that when we talk about the formation of priests to love the liturgy, that it is not so one-sided. A priest is formed to love the liturgy. And the liturgy itself forms that priest. In a certain sense, merely exposing priests to the traditional liturgy and requiring them to say it will instill in them a respect for it. But we cannot assume this effect will be universal, given the state of the Catholic priesthood. There needs to be a general turn to tradition that is bigger than the liturgy.
Thus, to some degree, the success of the Traditional Latin Mass is just as dependent upon the particular priest saying it as the Novus Ordo, the only difference being in the Traditional Latin Mass the disposition of the priest to do the liturgy correctly is simply assumed whereas in the Novus Ordo it is not. But, if we assume the good liturgical sense of a priest saying the TLM, it is only because today the TLM specifically attracts priests who are already disposed to respect the liturgy. This would not be the case if the Traditional Mass was mandated across the entire Church.
That's my thought experiment. Very interested in your observations and critique. God bless you.