Thing is, I don't think they are having new and more effective systems. They just want people to stop using what systems there are.
I think we should go to a system like the one in the US, where they take it straight out of the person's wages - and you know, if the other person is on benefits, they should take it straight out of their benefits too. Not a lot, just a percentage to remind that person that hey, they've got a child and they are responsible for that child.
When DH and I were at our very very worst about 6 years ago, and thinking about splitting up, the first thing he said was that we should talk about finances and that our DDs should not lose out. This is one of many reasons why we are still together and stronger than ever. Real men step up. (And real women too.)