CAMM2 is really just two DIMM sticks in one; you can even buy adapters where you plug in two SO-DIMM modules and get one CAMM2 (and there are also adapters for SO-DIMM to DIMM). Yes CAMM2 allows for faster and better signaling but it is entirely orthogonal to DRAM silicon manufacturing.

What you probably want is more memory bandwidth by default in affordable consumer PCs and I absolutely agree, it's ridiculous how we are stuck on dual channel memory controllers in consumer land despite core counts having exploded.