Except it’s not politically realistic. If the SC upholds the decision here, it’s highly likely that they will follow Williams(I) and other cases along those lines, reading the full faith and credit clause to require states to recognize SSMs from other states. SSM non-recognition also implicates the right to travel and interstate commerce. A friendly supreme court isn’t likely to stop halfway. The other highly important argument is that the UCCJA could be thwarted if a gay couple with children split – a spouse who would be chargeable with child support could simply move to a non SSM-friendly state, which would not recognize the parent-child relationship (or the marriage itself, meaning one spouse could also avoid a divorce action). Furthermore, there is the Oklahoma adoption case – OK was forced to recognize a gay adoption.
On the other hand, a court that overturns the 9th cir. avoids the issue entirely.
I just don’t think that there is a realistic middle ground.