I think most Utahns, for or against, anticipated this would happen at some point. While Judge Shelby’s decision does not at first blush smell of blatant activism, decisions made by “the people” being rendered moot by a imperious federal government is a sore point for many across the nation, especially in a conservative stronghold like Utah.
Expect an appeal, especially since the LDS Church, which staunchly opposes same-sex marriage and shows no signs of relenting on the matter, counts among its members many high-ranking civil servants throughout the state. I would also expect the appeal to fail, or if it succeeds, to be reversed eventually. If a state like Utah can be forced to abide policy with which a majority of its citizens do not agree, it causes me to wonder how far a leap it is to the next steps, such as forcing religions to perform same-sex marriage ceremonies (despite same-sex marriage proponents’ protestations that that will never happen). I believe a truly unbiased observer would see it as likewise inevitable.