This isn't that surprising. Anton Scalia himself predicted it in his dissent of Windsor. Since that decision there have been dozens of suits against the states with anti-SSM constitutional amendments. And even though this one is the first post-Windsor Federal case with a decision, it may not be the one that ends up at SCOTUS. There is an OK SSM case that has gone up and back down from the 10th Circuit (same as UT) that has been
pending for 9 years.
Boise and Olsen (who successfully argued Windsor) recently
joined a case in VA. That would be in the 4th Circuit which has more Dem appointees on it. The 4th circuit recently struck down VA's sodomy law (which Ken Cuccinelli got heat for defending). VA and the 4th Circuit are also where the Loving case (ending the ban on inter-racial marriage) came from. Boise and Olsen must have joined the VA case because they feel it has the best chance of going all the way.