Before I go to bed, I want to point out one more thing.
This whole presumption that humans will evolve at a particular rate, in a particular fashion, culturally, socially, biologically, is a cop out. You can't say for certain where society will evolve to. A virulent disease could pop up tomorrow and reduce humanity to a former shadow of itself. Global climate change could make life untenable for most of the planet as well in time.
The truth is that the argument "Well you won't put up with it NOW, but SOMETIME way off in the distant future" is a cop out. Its Lumie claiming that the world didn't end, but it STARTED to end, in 2012. Its Christians claiming well ONE DAY Jesus will come back and you'll pay for your sins, SOMEDAY.
Its a cop out argument which is unfalsifiable, and again, not science.
Kurzweil offers us something that is falsifiable. If we don't invent single atom transistors and don't find a way to reverse engineer the human brain and don't make a computer AI smarter than humans, then he's wrong. But if Dumar and I get in a time machine and travel to 100000 years in the future, and humans are still dividing up land and buying and selling property and exchanging goods and services for representations of their values which we call money today but may be called FLITHPITHNIPS in the year 102013, then Dumar can just say "Well, obviously they haven't evolved their consciousnesses enough yet" again, and never be wrong.
That's what he seeks with his disingenuous arguments. Unfalsifiability. Because what he wants is certainty. Certainty which cannot be erased. Much like every religious person is seeking certainty that cannot be disproven through observable facts of evidence.
Its really just a cop out argument all around.