Matt Novak, who runs the excellent retrofuturism blog Paleo-Future, has a fantastic essay up at MungBeing exploring the lost ideals of futurism that were lost with the ubiquitousness of sarcasm and irony:
I disagree with Matt's point that people no longer believe in the future in any meaningful way: the Internet is full of techno-utopians. But people no longer believe in the magic of technology. It is understandable: the average person is far more informed about the capacity for technological growth and its slowly evolutionary nature than they were fifty years ago. That's why retro-futurism is so alluring to people like me: they are technological fairy tales.
The Postmodern Paleo-Future [MungBeing]