I have GFE, a 970, a shield tablet and a shield tv. I played the witcher 3 almost primarily on the shield tv and had a good time doing it.. mostly. there were some quirks on how it connected to my pc that I figured out. It doesn't like it when you try to RDP into your pc for some reason, but I figured out I could just reboot and fix it.
I have to have GFE to stream to my shield devices. I just looked, and in task manager the most resource intensive program uses 44mb of ram. there were 10 or so processes, including the streaming servers for sending games to the remote devices.
I get that people think that this is a shady move, but in reality nvidia are correct. a lot of people dont even know who makes their gfx card, fewer update them regularly. the rub seems to be those people who dont value GFE, which you could reasonably not, but want up to date drivers. I bet there will be an ftp site you can get them from, they just wont broadcast.
It seems like a non deal IYAM.