Canon said they could do more with RF when they introduced it, but as a practical matter, we haven't seem much evidence of that yet.To add further arguments why EF-M will disappear:
5. The RF communication protocol is much more powerful and modern. The EF-M is just the EF protocol, which dates from 1987.
Just think on a computer there were serial ports in the 80s, now there is USB-C. Canon can do much more with the RF protocol in the future, also for cheap consumer lenses, than what is possible with EF. And the consumers are the ones that buy the latest automatic gadgets more than the pros. Just think of an automatic zoom lens with face detection & AF. It doesn't need to be an expensive parafocal lens if focus is adjusted as it zooms. E.G. Mom films a panorama and then zooms in on the kid's face with the press of a button, no more manual zoom.