How has it ALREADY affected straight people? Even just having the discussion about it -- right now, when gay marriage is not yet legal everywhere -- how has that already affected "traditional marriage"?
The righties claim that gay marriage will somehow undermine and destroy traditional marriage. To this I say: Au contraire, Pierre! Not only is there a complete lack of bad effect on straight marriage.... there's a positive GOOD effect. Gay marriage SUPPORTS and STRENGTHENS traditional marriage.
Here is something I've observed in my half-century-plus of hanging around on the planet: All this fooforah over gay marriage is making some (maybe a lot of) straight couples sit up and take notice. Take notice that there actually might be good reasons to get married, rather than just living together. That marriage has value. That it is more than "just a piece of paper."
The gay folks have been articulating this really well, this last decade or so -- better than I ever heard it articulated by straight people, back in the olden days when gay people had no reason to think marriage would ever apply to them. I guess it takes being denied something to really be able to see its value, better than those who can just take it for granted.