The spiteful part of me wants to say "Let the homosexuals have whats left of the institution of what now passes for 'marriage.' Let them deal with the 50%+ divorce rate, the lawyers, the judges, the ruined credit, the custody fights, the alimony, the child support...the whole nine-yards>" Why? Because it will ruin them the same way it ruins millions of people every year.
As much as I hate to say it, "marriage" as we knew it is dead. From my perspective, I'm not in a real big hurry to defend the expensive joke that passes for the institution of marriage. It's a government-controlled scam that turned my life upside down, caused untold hardship for my child, stripped me of my rights, bankrupted me and cost me in ways that no amount of money can ever replace.
If people want to stand up and fight for "marriage" in it's current form, fine. But they will get the same amount of help from me that I and millions of other people got from them when "marriage" and the divorce industry ran through our lives like a bull through a china shop...none at all. Make marriage worth defending again it will be big enough to take care of itself again, just like it was before the 1970's.