Didn't some of them split away in order to remain traditionalist? Will the upcoming canonical regularization require them to (at least sometimes) say the Norvus Ordo Mass?
Please learn and understand that: Neither the FSSP, nor the ICRSP, nor the IBP, nor the ISPN, nor the Transalpine Redemptorists is EVER required to say the novus ordo mass.
The only thing the Holy See has said about the issue is that no roman-rite priest, no matter what his affiliation, can be barred from celebrating the novus ordo mass if he wishes to do so.
Ok, that is good to know, thanks.
In the case of the Transalpine Redemptorists, they have always made it abundantly clear that they celebrate ONLY the traditional mass. In fact, the direct reason for their decision to seek regularization was the motu proprio Summorum Pontificum, which guaranteed them the right to celebrate only the traditional mass.
But if no individual priest can be barred from celebrating the novus ordo mass, than how can the Transalpine Redemptorists or other group actually GUARANTEE their claim that they celebrate only the traditional mass? If any one of the priests chooses to celebrate the novus ordo mass, then the group does NOT celebrate ONLY the traditional mass, no matter how clearly they say that they do. They can speak only of the current state (no priests now say the novus ordo mass).