My guess is that the US will have to wait the same as what happened in Canada until the federal Supreme court basically over-rules the state Supreme courts as they did the provincial Supreme courts in Canada. What happened here is that Ontario,the largest by population along with a few others started granting SS marriages. Provinces and I'm not sure about States in the US do not have the authority to "define" what is a marriage..ie one man/one woman, that is a federal jurisdiction. The provinces are/were only granted the right to issue marriage certificates etc. The federal Supreme court didn't actually change the wordings what they did was "read into, the Canadian Charter of Rights regarding marriage being solely between one man/one woman was against the charter,,ie unconstitutional and that it must also apply to SS couples. Once they announced that finding it sent out a clear message to the rest of the provinces fighting it that try as they might to stave off SS marriage in their respective provinces they would lose the battle on the first case to make its way up the ladder to the federal courts.
Of course this created a brouhaha all it's own with the anti-crowd screaming that judges were making the laws and not elected officials. The pro side claiming as did the Supreme Court that they were NOT creating new laws only defining the existing laws in a non discriminatory manner