In the article, Peter says:
Science fiction has collapsed as a literary genre.
I can't say I have noticed that one.
Update 2011-10-05: Some concrete evidence from Google NGRAM offers little support for Peter's position.
It's the only thing I saw in the article which seemed like nonsense. Additional nonsense has been located.
I do think there's less science fiction relative to fantasy than there used to be, but that's a much milder claim.
SIAI benefactor and VC Peter Thiel has an excellent article at National Review about the stagnating progress of science and technology, which he attributes to poorly-grounded political opposition, widespread scientific illiteracy, and overspecialized, insular scientific fields. He warns that this stagnation will undermine the growth that past policies have relied on.
Noteworthy excerpts (bold added by me):
In relation to concerns expressed here about evaluating scientific field soundness:
Grave indictors:
HT: MarginalRevolution