Assuming as Kurzweil suggests that the limits of computing hardware are really far out, i.e., we can expect Moore's "Law" to continue unabated until we hit computoronium, today's Googleplex should be available for $1000 in 2040 (2011 + 1.5 [years per doubling] * log2(1e6)). Somehow it sounds too good to be true.
People don't seem to think that much of the fact that a simple smartphone that you keep in your pocket today is more powerful than a computer powering a rocket 50 years ago.
Kurzweil keeps saying that people underestimate exponential processes (its also the topic of "The most important video on math" [1]), but I think it cuts both ways. It is by no means clear that the next 20 doublings will proceed at the same rate as the last 20.
People might just say, "Siri via the cloud is good enough for me, I don't need Siri running directly on my phone".