Popularly, traditionalists correlated the replacement of the old Mass with Concilium's concoction to the decline in Mass attendance. Logically, a reversal of this error would revive attendance, a mistake of thought Pope keenly quashes. What if that was true? I believe it was true once. This author cannot recall the year, but he remembers an old issue of the Tablet, England's "Catholic" magazine, which polled believers in that country as to whether or not they believe the new Mass should be replaced by the old. This survey, done in either 1982 or 1984, found nearly a majority favored the old Mass, the next closest had no opinion, and the smallest group liked the new rites. The Tablet took that survey thirty years ago, when the old Mass was within living memory for most Roman Catholics and laity. In 2016 the old Mass has not been the norm in any form for forty-seven years, two generations going on three. One cannot simply "turn the clock back", although that once would have been a reasonable pastoral option, one the bishops would not have heard.
Today spots of genuine growth, unrelated to immigration patterns, center on fonts of orthodoxy and reverence, not of the 1962 liturgy. While Oratories and vibrant churches do occasionally utilize older rites, they thrive because of the impulse to celebrate those rites, not the rites themselves. Traditionalists will doom themselves if they wall themselves into their parishes—inevitably posting dress codes on the door which as the women to dress as characters from Little House on the Prairie—and expect the unbelieving world to come to them. The old Mass could be an effective tool of conversion if only it and its environs were ordinary rather than extraordinary. Today I met a priest who takes an incrementalist approach with his congregation, singing the Agnus Dei and Pater noster in Latin; he hopes to install a genuine altar that can accommodate the "big six" in his parish of 3,000 families. Perhaps if he celebrates the old Mass once a week in his parish a few years down the road he might gain a side congregation; if he celebrated it thirty years ago he would have converted the city; if he did it now he would lose his flock.
The old Roman rite has a place in the restoration of the Latin Church, but it cannot be the only solution.