I once read Baby Boomer culture described as an ugly toad squatting on the rest of society, holding it back. The truth turned out to be a bit different though. Even the younger generations still willingly embrace 20th century life (probably more than they realize).
I think social media will finally tip things over into a new era though. The narcissism that is its core feature is also an outgrowth of 20th century individualism and a quest for self actualization. Pushed to its limits, it destroys its participants and society at large.
For anyone interested in these topics, I highly recommend The Century Of The Self. It talks about the intersection of psychology, marketing, technology and the generation that grew up with them in the 20th century.