Well, I think they could find the locales or build sets. I think it could be done, and I'd love to see one.
I know the PKD book presents many challenges. I'm probably more tolerant of CGI than you are, and I think they could do a convincing job now if they had the budget and a staff with real determination and imagination.
It was okay, I've seen it a few times, it didn't really convince me, it didn't really fill the bill for me.