...The Vatican Hath Spoken!
Archbishop Malcolm Ranjith, Secretary of the Congregation of Divine Worship and Discipline of the Sacraments spells it out for all those bishops who decided to take it upon themselves to make up their own norms, thus making it extremely difficult for the Extraordinary Form to take place in their dioceses, or taking steps to sabotage it completely (like allowing female servers or morphing elements exclusive to the Ordinary Form with it).
“The motu proprio Summorum Pontificum on the Latin Liturgy of July 7th 2007 is the fruit of a deep reflection by our Pope on the mission of the Church. It is not up to us, who wear ecclesiastical purple and red, to draw this into question, to be disobedient and make the motu proprio void by our own little, tittle rules. Even not if they were made by a bishops conference. Even bishops do not have this right. What the Holy Fathers says, has to be obeyed in the Church. If we do not follow this principle, we will allow ourselves to be used as instruments of the devil, and nobody else. This will lead to discord in the Church, and slows down her mission. We do not have the time to waste on this. Else we behave like emperor Nero, fiddling on his violin while Rome was burning. The churches are emptying, there are no vocations, the seminaries are empty. Priests become older and older, and young priests are scarce.”
Straight from the horses's mouth. RSCT to Patrick at Summorum Pontificum.