I think that natural evolution of values is part of what is to be human (and that is why I am against CEV). But here I mean some kind of disruptive revolutions in values in shorter time period, like in 20 years. And I think it will not in happen in 20 years as humans have some kind of values inertia.

But on loner time horizon new technologies could help to spread new "memes-values" quicker, and they will be like computer viruses for human brains, may be disseminating through brain implants. It could be quick and catastrophic.