I bring up the subject of the singularity from time to time, and it usually gets ignored. But when you look ahead twenty years the challenges it poses to the idea of the 'human' dwarf everything else. Outside of science fiction that most people see as mere entertainment, not much is said or written about it in the mainstream.
I think because it's just so hard to get your head around. We're in the habit of looking toward the future in the rear-view mirror, and we assume fundamental continuity with incremental changes. The idea of some major discontinuty shorts the brain circuits, and we choose to think instead about Obama's approval ratings or whatever we're comfortable with. But there is nothing going on in the world right now that has more importance; it will change everything. It would seem to be the kind of thing we should be talking more about.
And while Kurzweil might be mostly sanguine about the prospects, I think his 'engineer-think inclines him already to think like a cyborg, and if it comes to a choice, it's clear which side of the cyborg-human divide he'd prefer to be on. But unless something very dramatic changes in the spiritual makeup of humans soon (or some environmental cataclysm befalls us), the likely the human human future for all of us is one dominated by cyborgs.
We have no idea what that means, really. But we have every reason to believe that a major discontinuity lies ahead, and that our kids will live through it.