I don't get how the two services are even remotely related, let alone how one can replace the other, while at the same time taking away all of the things that made it worthwhile in the first place.
1) can you listen to YTM while your phone is off? Because I could do that with GPM. I would keep my phone in my pocket, and for whatever reason, if it was YouTube and I had to keep the screen on, it would register accidental touches...THROUGH JEANS!.
2) Will the YTM we get be ad free? Because I can listen to GPM in the shower with my Bluetooth speakers and not worry about commercials. But when I listen to a YouTube video, the problem is there are commercials every 5 minutes, and you can't skip them via Bluetooth speaker.
3) GPM wasn't a battery drainer, but because YTM has to have the screen on, you can't even listen to music without killing your battery.
I've had the GPM family plan ($15) for years, and switching to YTM just seems like a way for Google to either make me listen to add, or make me pay more for the same service.