Easy divorce laws have already done that. Marriage has gone from a lifetime commitment to a temporary union that lasts only until something better comes along. And when that time comes then the interests of the children are pretty much tossed out with the rest of the marriage. So I'm sorry, you can't blame same-sex couples for trivializing marriage and making it meaningless. That happened a long time ago.
The purposeful efforts of the communist-founded ACLU, the feminists and a variety of other atheist activists since the 1960s have been to destroy marriage, because they know it is the wellspring of privacy and individual liberty that is also tempered and refined by moral values. They have succeeded very well, if not as completely as they wish. Millions of lives have been ruined, quite purposely, by their heartless disregard for the truth of human nature. Blaming "society" now for what 50 years of elites have done will not fix the problem.
Conservatives badly need a coherent line of legal thought and test cases before the SCOTUS to re-establish the rights of the moral population -- "feminist theory", "civil rights theory", "critical theory" and test cases are how the satanic activists have dismantled our society. If Obama gets to appoint another radical looney to the Courts, all may be lost.