With the release of Universae Ecclesiae, Rome has essentially announced the end of the Novus Ordo and the eventual full-throated return of the Mass of the Ages.
You may think I'm over-interpreting the case, but I invite you to consider a single provision:
The Sacred Triduum
33. If there is a qualified priest, a coetus fidelium ("group of faithful"), which follows the older liturgical tradition, can also celebrate the Sacred Triduum in the forma extraordinaria. When there is no church or oratory designated exclusively for such celebrations, the parish priest or Ordinary, in agreement with the qualified priest, should find some arrangement favourable to the good of souls, not excluding the possibility of a repetition of the celebration of the Sacred Triduum in the same church.
You may recall that Summorum Pontificum originally said:
Art. 2. In Masses celebrated without the people, each Catholic priest of the Latin rite, whether secular or regular, may use the Roman Missal published by Bl. Pope John XXIII in 1962, or the Roman Missal promulgated by Pope Paul VI in 1970, and may do so on any day with the exception of the Easter Triduum
So what's the big deal?
Well, Easter Triduum is the apex of the liturgical year. It culminates in the Mass of Easter Vigil, "the mother of all feasts", the liturgy from which all other liturgies draw their power. Any Sunday Mass is only a Sunday Mass because it draws its power from the Easter Vigil, the re-presentation of Christ's Passion, Death and Resurrection.
Precisely because it expresses the fullness of what the Church has to offer mankind, there is only Easter Vigil Mass. At least, that was true up until now.
But now, it is possible to repeat every aspect of the Triduum, including the Mass of Easter Vigil, in the extraordinary form as well. A parish can have TWO Easter Vigils.
This is unheard of.
It is, quite frankly, incredible.
If I hadn't read it with my own eyes, I wouldn't have believed it possible.
There can be only one reason for such a massive and magnificent indult.
Rome is transitioning the Church away from the Novus Ordo.
Now, obviously She intends to keep some aspects of the New Mass - the calendar of saints, for instance (see #25). And I wouldn't be at all surprised to find that the NO's cycle of liturgical readings will eventually be incorporated into the traditional form of the Mass and the older form of readings dispensed with.
But, with this document it is clear that over the course of the next few decades, the Novus Ordo will, piece by piece, be stripped away.
Although this document breathes not a word about it, I think it is safe to say that extraordinary ministers, communion in the hand, communion under both species, ridiculous "liturgical" music, all of that is now being readied for the chopping block.