For those that think Apple can't pull this off, remember that they dominate the developer laptop market. They just need to incrementally slip it in via software and hardware.
For example I recently found myself doing some video encoding via ffmpeg. The default install from brew supports videotoolbox (T2 chip accelerated) out of the box, and boy howdy is it fast. It smokes my multicore intel server optimized with vaapi.
Soon users will do a `pip install pytorch` on their dev laptop and get the metal-optimized version of it without even thinking twice. Apple already has their foot in the door.