I agree. This is the case that will go to the Supreme Court. I think Windsor vs. United States was the groundbreaking case, but the case from Utah has got to wind up coming before Justice Kennedy and I think he is going to be the fifth vote to repeal all of the marriage bans.
I don't get why people think Kennedy is so rock solid on this issue. Just because he overturned DOMA? Any real conservative would be against DOMA because it violates states rights. The difference is that Kennedy isn't a hypocrite whereas most of the GOP (including Scalia, Thomas, Alito, and Roberts) is.
No doubt Kennedy is playing his cards close to his chest on this issue. There's no way to know for sure what he'll do. But he's given a few hopeful signs. Like you said, everyone expected Kennedy to vote to overturn DOMA on state's rights grounds, but the equal protection language in his decision in
Windsor was way stronger than anyone expected it to be. You had all the state's rights stuff, but then he threw in the "bare animus" language. Now its true that in that case state's rights and equal protection pointed in the same direction while when it comes time to overturn state bans the two will be in tension. However I think Kennedy knew that state courts would start citing Windsor to overturn their own bans (as NJ and New Mexico have done). If he didn't plan on that happening, he would have just couched the
Windsor decision in strong states' rights language.
The other promising sign is that, contrary to expectations, Kennedy ended up dissenting on the standing issue in
Hollingsworth, meaning he was ready to decide the issue on its merits.