It may not be practical but this is a very intriguing idea to me.
I mean, it gives you a chance to pause at your 7th year and say, "Is this working for me?" "Do I want to continue?" And it kind of gives you an easy out without the whole mess of lawyers and divorce papers and courts.
I love my husband, but I never needed the legal side to make it whole.
And, for the record, I have been married six years last month!