Are you implying that the Mass per se has in effect been abolished by VII and the introduction of the new missal? Quo Primum as such is an Apostolic Constitution, meaning, as per the Code of Canon Law, canon 20 if I’m not mistaken, it can be superseded by another Apostolic Constitution issued by a succeeding Pope, provided that the new constitution or law states so explicitly, which Pope Paul VI actually did in his
Missale Romanum.
*
Missale Romanum *was quite explicit when in its last pararaph it says:
The effective date for what we have prescribed in this Constitution shall be the First Sunday of Advent of this year, 30 November.a We decree that these laws and prescriptions be firm and effective now and in the future, notwithstanding, to the extent necessary, the apostolic constitutions and ordinances issued by our predecessors and other prescriptions, even those deserving particular mention and amendment.