If only that were true. Marriage is a state-recognized term with state-recognized benefits. It's a contract that the state monitors.
What are you implying? Are you implying that the state get out of the business altogether? My mother loses her special rights when my father is in the hospital? They lose their tax incentives?
I have no problem with saying that the state will only recognize civil unions (and the legal and tax benefits that come with it) and can leave the term "marriage" to the churches... but "get out of it completely" doesn't have a defined meaning at this point in time.