New Marriage: Time-Limited and Renewable

I've been thinking about the exact same thing -- falling in love and getting a new, improved "Time Limited Marriage":

So who's in? We just need a few couples to choose a TLM over the traditional route and soon we'll have a wave of converts. I can hear the ceremony now: "Do you, Jack, take Jill to be your lawfully wedded wife for at least 3 wonderful years with the best intention of more, but with the mutual understanding that these forthcoming 3 might be all?"