The important part is that the Diocese apparently engaged in negotiations, offered a settlement, and then withdrew it and put the knife in.
The theology is just the reason for the "divorce", not the basis of whether there will be an automatic settlement according to a formula. In the "no-fault" atmosphere of today's courts regarding morality, fault probably won't be useful as a basis for recompense. On the other hand, the members of those churches were the ones who paid the monies to support those buildings, often for many generations of families, so they can't be expected to walk away with nothing.
For centuries, when a group of churchgoers had a radically different idea (e.g., God approves of homosexual conduct), they would leave the established church and found a new church or denomination. That involved real sacrifice for their beliefs. In this case, the radicals merely took over the church, and claimed its inheritance. They'll end up with lots of gorgeous buildings, and the hard-earned efforts of real Christians, but won't be able to support it with actual parishioners.