Why is that "pretty big stuff"? Compared to everything that the Ecclesia Dei communities have been doing for 25+ years that is nothing.
But many things have changed to a large extent since 2007 and Summorum Pontificuм in the mainstream Church, that is Bishop Fellay's point, and this is inspite of the persistent opposition from liberal and heterodox Bishops. What Bishop Fellay is saying is that besides the fact that this is changing slowly even among the older Bishops, among the younger generation of new Bishops, priests and seminarians especially there is a dramatic and very perceptible change in the attitude toward all things traditional. That leaves great scope for the future. He also gave other statistics, I can't recall them now, they're in that sermon.
Moreover, all he is saying is that a handful of bishops want to do the Latin Mass. Big deal.
I'd disagree that the widespread availability of the traditional Mass is trivial or unimportant in the restoration of the Church as you seem to make it out. The Mass is fundamental in every sense and it's importance cannot be overstated.
Still, these Bishops and all are friendly toward and favorable to the overall perspective of the Society, and that includes the doctrinal matters as well - religious liberty, ecuмenism, collegiality etc. The Roman authorities do not speak, openly at least, of the only true union by the return of dissidents and heretics to the true Church of Christ, or of the obligation of each State to be Christian to the exclusion of all other sects, and on these matters, the bad fruits of this silence are apparent in the world today, and not a few Bishops and clergy in the mainstream Church wonder if the Society's way, the traditional way, is the right one, the more effective one, the one demanded by truth and charity.
Also, Daniel's post seems to be clearly referring to this very sermon, since this is the place where Bishop Fellay spoke of the Jєωs and Masons being most alarmed by the canonical regularization of the Society and it's being officially recognized as what it always was, Roman Catholic.