The people want marriage. You might not. Just as some do not think there should be a standing military or others do not believe that we should have public services, such as a police force, or EMTs, or firefighters, or public schools. But the majority, vast majority of citizens want those things, including marriages. So unless that changes to where the majority wants the government out of marriage, then it isn't going to happen because there is no legal standing to honestly challenge marriage as a legal entity itself within US laws.