But equally, the husband has been supporting the wife for those fifteen years. So if we're trying to roll the clock back fifteen years, then is he not due all that money back? He could have invested that money in something and been much wealthier now as a result.
Dividing the assets I'm okay with, because that is what marriage is about. You are becoming a single legal entity with full entitlement to one another's assets. But there is no way in hell either party should get a cut of the future income of the other person. Once the marriage is dissolved, all legal obligations should also be dissolved.
I don't think it's about rolling the clock back, it's about allowing for the future. The woman in this example would have a perfectly good future if she's as employable as she would have been with 15 years' work under her belt, but fact is that's not true.
Admittedly this is taking it to extremes, but lets imagine for a second that a couple get married at 30, the husband agrees that his wife should quit her job and act as a stay-at-home housewife/parent/socialite. Now, 35 years down the line, he decides that he wants a divorce.
The woman, then, is left with no pension, presumably 50% of assets (which may be a 200k share of a house), and no income. Not to mention she's 65.
Now, under your argument, that's fair enough. He can keep his pension, and sail off into the sunset. Meanwhile, she needs to move into council accommodation and live off of goodness knows what income. It's not exactly reasonable.
That to me is the point - it's not about rolling things back, it's about accounting for the fact that people make very serious life choices when they marry, and just erasing them several (or 35) years down the line doesn't work.
Fox also makes some good points, though I feel that ascribing value to the non-working partner is a tangent in terms of your argument.