That's what people in semiconductors do -- they try to take a bunch of features and package it in a single chip to reduce costs. There are chips out there with temperature, accelerometer, and proximity sensors packaged in a single unit. There was a time when an actual quartz crystal was needed as a resonator, and now those are replaced with mems technology so that one can package more into a single silicon chip.

I'm sure we can all remember the time when the cpu & gpu were separate chips.