Fifty years ago, book shops didn't have separate sections for science fiction. Now they have large sections.
I can't speak to fifty years ago, but I can tell you that 47 years ago Bookland, a smallish and not extremely ambitious bookstore in a suburb of Wilmington, Delaware definitely did have a science fiction section.
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