In real life we all know that isn't the way it works, with gay marriage already legal in 13 states or whatever, and legal in the military and FBI and federal employment and immigration, then it will be legal in all states.
A few states are not going to become islands that do not recognize marriages of federal employees and people who move into their state and of the military, the best that could be hoped for is that they don't have to PERFORM them, but there will not be islands in America where families are not legally families.
Not with well over half the states rejecting so-called gay marriage by the vote of the people, I sure don’t see gay marriage becoming the law at all. It’s really more like an extreme minority of states that have gay marriages. New England/New York, Minnesota, Iowa, Washington and forced on California. Not too many.