Two questions: data, and if it were not popular, why issue the MP?
Data: about one in every 250 parishes regularly offer the Mass in Latin. Source: Center for Applied Research in the Apostolate, quoting Mass Times Trust, operators of the popular website
www.masstimes.org from the 117,000 parishes for which listings are available (in more than 200 countires).
1 in 250 is .4%. No distinction is made between the EF, and the OF in Latin, so it is possible that the four tenths of one percent is not the sum of the EF, but that the EF is celebrated regularly less than that. Or that may be the EF statistics. Note: that is not a link; you will have to go google it I suspect.
Why did he (the Pope) give the MP? One obvious conclusion is that he wanted to move forward with the healing of the right between the SSPX and the Church. It is also possible that he or others at his request simply did some actual research on the issue of whether or not it had been surpressed, and came to the conclusion that it had not, so he simply made clear the status.
There seems to be a popular opinion among people who favor the EF that it is wildly popular, gaining vast ground, bound to take over the OF (that reflects a range of opinions, actually). In reading posts of people who are in favor of the EF, and who take pains and the time to report another parish celebrating it, and comment on all the priests who are being trained in it, I am left with the impression that they have no idea the actual number of parishes in the US even, are of only small regional experience, and have more enthusiasm than information.
Enthusiasm is not wrong, and please don’t construe my comments as indicating such. It is simply that I have been watching the issue for years (I was in high school when Vatican 2 was in process, and served Mass from 6th grade through middle college); and I have been astounded at how little some seem to actually know in terms of real world numbers and statistics. If a diocese, for example, had three parishes with the EF, and now has 12 with the EF, that is a 300% increase - sounds phenomenal. Except that of the whole diocese with 360 parishes, that is an increase from .8% to 3.33% - in other words, 96.67% of the parishes don’t have the EF. (Chicago comes close to these numbers, as an example).
I have brought this information up before, and have been flamed for “throwing a wet blanket on such a tremendous change”. The facts simply are the facts; the EF is extremely rare world wide; part of that is due to having few priests who can say it, few who can say it who wish to say it; few in training to say it; few who promote it - and few bishops who promote it; and few who are demanding it or requesting it. Also true is that we have about two generations who are totally unfamiliar with it (so they have no reason to ask for it) and few who even know that it could be available.
Even in the dioceses which have promoted it, it is only a small portion of the total number of Masses which are said each weekend.
Other information is the letter he wrote accompanying the MP. He makes it clear there that he does not anticipate it becoming very popular. So where this idea comes from of its popularity I can onlyl guess; I suspect that it is in part due to the fact that those who like it, do so very strongly, and do not understand why others are not likewise.
Part of the problem, I suspect, also stems from the fact that some (certainly not all) who style themselves as Traditionalists have a tendency to see the Church as rigidly and narrowly defined. While doctrine is defined, and serious moral matters are defined, and rubrics are defined, those three items are not the sum and substance of the Church. Christ is. And Christ is not defined by those items - those items are defined by Christ. In other words, Christ, and His Church, are more than just those items. What those same few Traditionalists also fail to acknowledge is that one can be a true, practicing, faith-filled Catholic, following the Magisterium, not dissenting or protesting, believing what the Church teaches, and not be a Traditionalist.
Those who have that mindset simply cannot conceive or perceive that others may be just as Catholic, and yet not prefer the EF, not prefer polyphony or Gregorian Chant; receive in the hand, and do other things and have other opinions that leave the Traditionalists aghast.