In all seriousness, though, while my friends and I are hardly a representative sample, I know quite a few people who started to reconsider the idea of getting married when gay marriage became legal here. That is to say, before that point we generally thought that marriage was an antiquated idea about men owning women and we didn't want anything to do with it. The legality of gay marriage really revitalized the whole idea for us.
I doubt I would be in a mixed-sex marriage right now is same-sex marriage was not legal. My life not be otherwise terribly different.