I know it isn't polite to correct the Holy Father, but there is quite a bit of liturgical diversity in the Catholic Church which His Holiness is the visible head. Ecclesial unity is not based upon a single rite and a single rite, as we can see below, can be quite diverse so as not to appear to be even the rite that is being celebrated.
That all these rites are permitted within the context of ecclesiology and ecclesial unity under the papacy makes one scratch one's head as to why the pre-Vatican II rite of the Church cannot be included in this diversity of unity.
Maybe the Holy Father would consider making the 1962 Roman Missal more in line with what Vatican II asked? Allow the Liturgy of the Word to have a official vernacular lectionary and that the Liturgy of the Word be celebrated as in the Reformed Mass. What's the problem with that?
Allow Extraordinary Ministers of Holy Communion by way of deacons and officially installed acolytes and as it concerns acolytes allow females. What's the problem with this?
Thus the Roman Missal of 1962 remains as is except for the manner of the Liturgy of the Word and who distributes Holy Communion.
Oh, and yes, allow for some vernacular, only for the changing parts of the Mass. What's the problem with that?
List of churches sui iuris: