7 years and done?

Last night, at work, I had some down time. I sat thinking about the couples I know and know of. Family, friends, strangers...
And what struck me was that 2 good people did not necessarily make a good marriage. 'Being a good person' is not the criteria for a good marriage. If you can ignore, accept and accommodate, then that is far better than all the goodness in the world, for marital purposes at least.
How many times have we asked "how does her/his husband/wife put up with her/him", and then have been surprised to find that they don't get along that bad at all?
I guess that's were the ignoring and accepting and accommodating comes in... not any one, but all three.
That's a tough act -- you have to be either highly 'stupid/dumb' or half a step away from sainthood to do that.
Then again, it begs this questions. What is a good marriage? Where the children are happy/well-rounded? Where the spouses are equal? Where the husband is a good provider? Where the wife is an awesome home maker? Where they have orgasmic sex every day? Where there are no expectations? Or where all expectations are met?
I am beginning to endorse that German politician who says by law marriages should be a 7-year contract, extendable by mutual consent.
An interesting thought, and one that probably would do a whole load of good.
Not because we can get done with it and move on.
But because, we will make the best of the time together, when we know it could be for just 7 years -- when we know that we can't wait too long to say 'I am sorry', 'Let's try', 'I love you', 'Let's have a quickie' or 'Let's send the kids away for a day for a romp'.
We know we have only 7 years, so we will hopefully be less rude and more accommodating.
Of course, can't rule out being total jerks either, because we know after 7 years we would be free -- but such relationships are not meant to be in the first place!