Marriage isn’t a state issue today, there is no way that states will be allowed to ignore families that relocate or get transferred there by the federal govt, and military, pretending that ‘gay marriage’ is a state issue is a way to “get r done” for gay marriage nationally.
Besides the feds have to decide on many millions of marriages itself, such as in widow benefits and immigration policy and in the military and federal employment.
The number of gays in the US is about 2%.
The number of gays who live in states which allow gay marriage and marry is much less.
The number of gays who are in the fed gov't, married in a gay state and move to a non-gay state is much less again.
The front on gay marriage is still at the state level. IL just rejected gay marriage and that is because 20 black legislators blocked it despite pressure from the WH. I don't see gay marriage getting much more traction at the state level.