Well, some people WON'T be satisfied. I think those people have no business getting married. It's a big commitment. I agree that the exits should be sealed and that people should only enter into this if they're really ready to commit to a life together, moving in the same direction, helping each other along the way.
I think marriage should be separate from civil unions, which should be contracts of variable lengths (2 year, five year, 20 year, whatever). Marriage should be forever, and this is coming from someone who's been divorced before.