My understanding is even though the GMC has more members, the psUMC will keep the property. Perhaps they will sell some of it back to the UMC. If that is true the quickest breakup is the best because the GMC is subsidizing the psUMC.
What I wonder is this: if only a few churches in each annual conference leave the psUMC to join the GMC, an annual conference will be able to absorb those costs. What if 100 or more churches leave? That is a lot of property and overhead for an annual conference to absorb. At some point, each psUMC Annual Conference will have more property than they can support. Will the local churches then be able to "buy themselves back" for pennies on the dollar, or less? Only time will tell.