Private Masses at the same time at multiple altars (no concelebration of one Mass)
Summorum Pontificum which should force every parish where there is a stable group of parishioners wanting it to have the EF Mass each Sunday at a regularly scheduled time and to even make one of the previous OF Masses an EF Mass. The desire for this stems from a complete dissatisfaction with the OF Mass even when, as it is here, it is celebrated by the books, with all the options available for it and with dignity and solemnity, i.e. all parts sung, incense used and classical vestment and rehearsed "ministers" i.e. altar servers, lectors and EM's.
The second school which I embrace is to understand the allowance of the EF Mass as "extraordinary" meaning there should be a stable group of people who desire it. The question is how often depending on the number who "desire" it regularly. The compromise I have come up with is to provide it weekly on Tuesday as a Low Mass and once a month on Sunday as a High Mass, but at an additional time rather than replacing one of the four Sunday OF Masses. I've also allowed it for certain Holy Days of Obligation and for special occasions, such as The Commemoration of All Souls with a "Concert Mass setting" as well as our Patronal Feast Day of Saint Joseph on March 19th using the concert Mass of Schubert's "Mass in G". I have honored the request for weddings in the EF tradition having celebrated two thus far and Requiems if requested having celebrated one and baptisms in the EF having celebrated two. In other words I am happy to honor requests for the EF form of the Sacraments for Baptisms, Marriages and Funerals.
But a part of the second school of thought is what I believe Pope Benedict intended, in part, by allowing local priests to be able to celebrate the EF on a liberal basis, the mutual enrichment of both forms of the Mass as a two way street. In other words, the EF should not only affect the manner in which the OF Mass is celebrated in a more solemn and choreographed way by "saying the black and doing the red" but the EF should be affected by the manner in which the OF Mass is celebrated when done so properly, i.e Scriptures in English and facing the people, the priest a bit more relaxed and not robotic or rigid in movements (more flexibility in other words).
We can see the Holy Father bringing some of the EF influence to the OF once again--kneeling for Holy Communion and receiving on the tongue, flexibility in choosing vestments and daring to use the Roman style of vestments, insisting even outside of Rome that the preface and Eucharistic Prayer be prayed in Latin (that is new to this Pope and took place a couple of years into his papacy, at first he did pray the preface and Eucharistic prayer in the vernacular even in Rome). At Christmas he allowed the Responsorial Psalm to be sung in the Gradual Form of the EF Mass.
But keep in mind, he also prays the Mass in the vernacular for its other parts and even at St. Peter's when the event is more local, most of the Mass is in Italian. He uses all the Eucharistic Prayers, not just the Roman Canon, although these are prayed in Latin.
Since he has yet to celebrate publicly the EF Mass, we have no idea how he would bring OF sensibilities to it--time will tell if he will celebrate this Mass during his pontificate but not having done so thus far speaks volumes by its absence.
In other words the Holy Father while not "founding" a new form of the Mass is now "affecting" for a later pope to institute in a more formal way some of Pope Benedict's understanding of what a "reform of the reform" Liturgy should look like, feel and be celebrated and it is not a complete return to the EF Mass at all.
Time will tell. Just as we can't say that Jesus Christ founded the Church during His public ministry as we have it today (unless we do so from our faith perspective that He through the Pentecostal Holy Spirit, our Glorious and Risen Lord is always present guiding the Church in all ages through His Body, the Church which He "affected, establish, founded both implicitly and explicitly" during His public ministry)we can't say that Pope Benedict has founded a new Liturgy but he might well be affecting the founding of a new form of the OF Mass in the future.