This is the annual week for Christian Unity.
Is there not another angle here?
In Summorum Pontificum we read:
Art. 5, § 1. In parishes, where there is continuously present a group of the faithful attached to the previous liturgical tradition, let the pastor willingly receive their petitions that Mass be celebrated according to the Rite of the Missale Romanum issued in 1962. Let him see to it that the good of these faithful be harmoniously brought into accord with the ordinary pastoral care of the parish, under the governance of the Bishop according to canon 392, by avoiding discord and by fostering the unity of the whole Church.
Also, in Pope Benedict’s accompanying letter, wherein he explains something of his mind about the Motu Proprio:
Pope John Paul II thus felt obliged to provide, in his Motu Proprio Ecclesia Dei (2 July 1988), guidelines for the use of the 1962 Missal; that document, however, did not contain detailed prescriptions but appealed in a general way to the generous response of Bishops towards the "legitimate aspirations" of those members of the faithful who requested this usage of the Roman Rite. At the time, the Pope primarily wanted to assist the Society of Saint Pius X to recover full unity with the Successor of Peter, and sought to heal a wound experienced ever more painfully. Unfortunately this reconciliation has not yet come about. Nonetheless, a number of communities have gratefully made use of the possibilities provided by the Motu Proprio. On the other hand, difficulties remain concerning the use of the 1962 Missal outside of these groups, because of the lack of precise juridical norms, particularly because Bishops, in such cases, frequently feared that the authority of the Council would be called into question. Immediately after the Second Vatican Council it was presumed that requests for the use of the 1962 Missal would be limited to the older generation which had grown up with it, but in the meantime it has clearly been demonstrated that young persons too have discovered this liturgical form, felt its attraction and found in it a form of encounter with the Mystery of the Most Holy Eucharist, particularly suited to them. Thus the need has arisen for a clearer juridical regulation which had not been foreseen at the time of the 1988 Motu Proprio. The present Norms are also meant to free Bishops from constantly having to evaluate anew how they are to respond to various situations.
Well, I emphasized that last part just as a little shot at some episcopal fussbudgets who are overly evalulating everything having to do with the old Mass, but I digress.
The Pope continues…
I now come to the positive reason which motivated my decision to issue this Motu Proprio updating that of 1988. It is a matter of coming to an interior reconciliation in the heart of the Church. Looking back over the past, to the divisions which in the course of the centuries have rent the Body of Christ, one continually has the impression that, at critical moments when divisions were coming about, not enough was done by the Church’s leaders to maintain or regain reconciliation and unity. One has the impression that omissions on the part of the Church have had their share of blame for the fact that these divisions were able to harden. This glance at the past imposes an obligation on us today: to make every effort to unable for all those who truly desire unity to remain in that unity or to attain it anew. I think of a sentence in the Second Letter to the Corinthians, where Paul writes: "Our mouth is open to you, Corinthians; our heart is wide. You are not restricted by us, but you are restricted in your own affections. In return … widen your hearts also!" (2 Cor 6:11-13). Paul was certainly speaking in another context, but his exhortation can and must touch us too, precisely on this subject. Let us generously open our hearts and make room for everything that the faith itself allows.