I don't know if there is any issue with such a generational divide...
It currently appears that it's only a matter time before legalization.
Nate Silver projects when each state will legalize gay marriage via a regression model with the following variables:
1. The year in which (a gay marriage type) amendment was voted upon;
2. The percentage of adults in 2008 Gallup tracking surveys who said that religion was an important part of their daily lives;
3. The percentage of white evangelicals in the state.
He projects about half of states will legalize by 2014 and the rest by 2024. I personally think the status quo bias is a bit stronger than that and it'll take a little longer...
*Edit - Nate Sliver actually projects "the dates when the model predicts that each of the 50 states would vote against a marriage ban." The dates seem a bit more resonable now, but i still would be more conservative in the projections. Though maybe we've hit a tipping point?