Please, AAM, I beg your prayers for Bishop John-David Schofield. He and I are from opposite sides of the church (he's quite evangelical, I'm out on the anglo-catholic wing), but a kinder, more gentle spirit you're not likely to find -- especially in a bishop. The condition he was in when I last saw him, this could become nasty enough to be fatal.
Thus far Bruno has uniformly lost in the California courts. I would think he would have even less ability to stop another diocese from leaving (presuming the parishes in that diocese agree). If the precedent is established in California that parishes can leave, Bruno et al can be held liable for exemplary or punitive damages for filing frivolous lawsuits.
Prayers going up for Bishop Schofield. He's a wonderful man & a faithful shepherd to Christ's sheep. I have no doubt that he would be a willing martyr to the Faith. One can only pray that it isn't in God's plan.
Saint Michael the Archangel, defend us in battle, be our protection against the wickedness and snares of the devil; may God rebuke him, we humbly pray; and do thou, O Prince of the heavenly host, by the divine power of God, cast into hell satan and all the evil spirits who wander throughout the world seeking the ruin of souls. Amen.