This is very true, i'm imagining someone sitting at their surface "ummm wait, its not going up, oh oh my bluetooth was off"... "wait now it's saying I don't have permission to project on this screen" "oh you need to talk to Jim, he'll set you up an account"
I don't think this will be the case, as the Surface Hub supports so many graceful Fallback Options. It even works as a dumb Miracast Receiver, if all else fails.
and then everyone huddles around the tiny tablet.