Savta_be, let me see if I got this straight. You are saying that if we teach our kids that marriage is a 50/50 proposition we parents should be splitting the support equally.
Leaving aside the impossibility of support for many parents, I disagree with the first half of the premise. We should NOT be teaching that marriage is fifty fifty, we should be teaching our kids to give 100%. Not to become doormats; we presume their spouses are menschen. But never to become scorekeepers.