Fr Zuhlsdorf, that Colossus, asks for feedback about Summorum Pontificum, Monday's the Feast of the Exaltation of the Holy Cross is the second anniversary of its implementation. Some of the accounts from English diocese, if they are true, should cause the Holy See some concern. For the most part people seem to be saying there has been little change, there isn't a great flurrey of additional Traditional Masses being said.
I think most of Fr Z's correspondents miss the point of Summorum Pontificum. I am sure the Holy Father is not displeased with what has happened so far. Sum. Pont. is about encouraging the celebration of the Traditional Mass but it is much more than that, it is primarily about the Church living in peace with itself and with its history. It is about the hermeneutic of continuity.
It is about bishops and priests respecting the things that their parents understood to be holy and sacred.
When I was a seminarian less than a decade after the liturgical changes, we experimented with all sorts of "liturgies", the only thing which was forbidden was the "Tridentine" Mass. One heard, not too long ago, about seminarians in Rome being expelled, or being blocked from orders, for attending the Traditional Mass or being too close to the FSSP or ICKP. Sum Pont is about overcoming this.
In my diocese before its publication there were about three priests celebrating the Traditional Mass, two years on, the number has more than doubled, mainly with younger priests celebrating the Mass.
I don't think the intention was that every parish would immediately offer the Traditional Mass on Sundays, although a good thing, that would be a rupture with the immediate past, something the Pope would see as undesirable. I think the intention is more the "gravitational pull" of "Tradition". This for me was most evident in the installation of new Archbishop of Westminster, a real contrast with the installation of his predecessor.
In my youth liturgical "experiment" involved coffee tables, not wearing vestments, pottery vessels, bean bags, nowadays that is soooo yesterday. Today experiment is more likely to be about Gregorian chant, ad orientem, classically cut vestments, silence, receiving communion kneeling.
What the Pope has done is to give his blessing to a grassroots movement, which includes theology, morals and holiness too, as well as liturgy, that will come to fruition in a generation or two. Gradual growth and deep roots are his concern, he is not a quick fix Pope.