Marriage, Gays and Commitment

I was talking with a friend yesterday about the concerns some people have about gay marriage undermining the family. We concluded that commitment is more important than what is on paper. Plenty of heterosexual people come and go in marriages without concerns being raised about undermining the family. It seems to me that gay marriage is a public commitment of two people to each other. Now we just need to find a way to strengthen and make lasting the commitment of everyone making marriage vows, gay and straight.