The political spectrum is constantly shifting to the left, so while conservative people can't fathom the idea of gay marriage now, in 30 years all of our kids will be wondering what the hell the fuss was, and will instead be fighting to allow marriage between dogs and horses.
That's what you really need to watch out for. By the time that comes around, if you're still opposing canine/equine matrimony, you're going to be the cantankerous old geezer.
'Copperfield,' said Mr. Micawber, 'farewell! Every happiness and prosperity! If, in the progress of revolving years, I could persuade myself that my blighted destiny had been a warning to you, I should feel that I had not occupied another man's place in existence altogether in vain.
- Wilkins Micawber