I would have thought that much of MITHC would be pretty difficult to translate to screen. If one ditched the fine details of PKD's philosophical musings, the I Ching, The Grasshopper Lies Heavy book-within-a-book, Japanese aesthetics, and so on it would leave merely an alternate history fantasy as a stunted revenant. Yes, I also recall how
Riverworld was butchered in its adaptation, as was
Earthsea.