Quite a few already have been (with varying levels of success and/or faithfulness) : We Can Remember It for You Wholesale, The Minority Report, Paycheck, The Golden Man, Adjustment Team, Second Variety
I’d think that’s generally true anyway, novels are often too long to easily condense into a screenplay.
The novel (in my very humble opinion), is one of PKD’s worst, and is not remotely as interesting as it sounds.
I hate to say it but I have the exact same opinion. But the premise is just so damn awesome that I’m looking forward to this series. Hopefully they took lots of liberties.