If the government disallowed divorce for any reason, due to the responsibility to children and the consequences of divorce, I don't think gays would be at all interested in the institution of marriage. I don't think a lot of heteros would be either. It probably would be a good idea.
It most certainly would. It would tell people that marriage is not just about the wedding or being with the person you love. Marriage, like fighting a war, is a serious mission. Unless you are willing to stick it out for the long haul, then maybe you should stay home and let the real men be the heros, so to speak. :)