Living together without marriage or living apart as sexual partners with perhaps kids is not new. The ghetto has been doing this for years. What is new is the spread of ghetto behaviors to the middle and upper classes.
It seems that people with more money would be more able to raise a family than a family with little income. I think young people today seem to be test drivng relationships, which I think is a good idea and would reccommend it in some shape or form to young people. You never really know who you're marrying until you're living with them all day every day. People have a funny way of hiding their annoying or bad qualities when you're just dating. I've made that mistake before.