Why should they find another parish? One Tridentine Mass is understandable; three is an attempt to turn the parish into an FSSP parish, without the permission of the bishop.
Fiorenza should have allowed a Tridentine Mass; in its absence, Fr. Zig should have continued to work toward it. Now, he'll be lucky to ever work in Houston again.
You call it "luck" to work for Fiorenza the Terrible, Lord of Committments?