I have. There are still people publishing books that go in the SF section of the bookstore, but I could count off on one hand the number of authors I can remember who are feeding people hope instead of stylish postmodern cynicism.
A great proportion of science fiction has always been predictions that science will kill us all. Are the cynics stealing market share from the doomsayers, or from the hopeful?
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