Yeah, I expect them to get relegated to Chip–on–Board (the little black epoxy blobs you'll see in 4-function calculators, cheap multimeters, & the like) ASICs as integrated MCUs and as soft cores in some FPGAs. I'd only go with an 8-bit or 16-bit chip at the extreme end of cost–constrained ultra–high–volume design already, 32-bit MCUs are cheap enough for everything else.