Reasonable and astute point.
"An Economist article this year exploring the state of innovation noted that centuries of scientific progress means it takes ever longer for people to reach to the frontier of any field, much less push past it. It also stressed that much of the technological low-hanging fruit is long gone."
Also true, and oft-overlooked.
"Thiel is at least putting his money where his mouth is at Founders Fund, his venture capital firm making investments into robotics, artificial intelligence and biotechnology (alongside a lineup of dot-coms)."
Ironically, AI was jump-started by DOD dollars,[1] and biotechnology by NIH dollars. Robotics had substantial manufacturing implications and got money from that area, but has also benefited heavily from defense money (think UAV's, etc).
[1] http://en.wikipedia.org/wiki/AI_winter#DARPA.27s_funding_cut...