Here's my new prediction in light of the return to multi-generational family: it will impact divorce rates and the number of divorces will decrease from the current 50%. You'll also see a drop in the nanny business as the grandparents return to traditional role of pinch-hitter care provider.
This is just my opinion, but guys are probably less likely to come rolling home drunk at 2 a.m. with lipstick on their box shorts if mom or the mother-in-law is living there.
Also, the extra help with child care will take some of the pressure off the parents, whether both work or not.