I'm going to be far more pessimistic and say that within the next 20-100 years we either start another world war, get killed off by an epidemic, alter the global climate enough to cause a devastation in the population, destroy the ozone enough that we can't go outdoors, or use up so many natural resources that the technology era comes crashing down.
Or, of course, there's always this (I know it's obscenely old):
http://www.ebaumsworld.com/flash/endofworld.html
Btw, damn you Chaz, even though I was sitting here when you found that picture, I keep thinking to myself "Wow, who's the new girl on the forum..."