I loved that book. Also The Space Merchants, and pretty much anything of his I've encountered. One of the greats.
There has already been a metaphorical sequel: Christopher Nolan's "Inception". Look at how the ending worked, and the analogy is clear.
I'd like "Radio Free Albemuth" or "The Man in the High Castle" myself (although I have an affection for "Eye in the Sky", it's too dated with the anti-communism shtick and updating it could easily wreck it).
I agree with you about Blade Runner, but PKD did write one sort-of series: Valis, The Divine Invasion, The Transmigration of Timothy Archer (cf http://www.philipkdick.com/covers/valis_trilogy.jpg )
Certainly there is no need for a sequel here, and I expect that this will be terrible.
As someone who has made major contributions to multiple areas of knowledge, which has been your favorite, and why?
PS - I thought "Disturbing the Universe" and "From Eros to Gaia" were magnificent - thank you!
I'm curious where you work...
Precision when discussing controversial issues is a good thing. Doubly so when the controversial issue involves lethal weapons.