I think they could do better pricing wise. I'm happy paying $8 for two simultaneous streams, if I would to do any more like three or four, I wouldn't have enough bandwidth to do HD. Right now I lag immensely online if even stream with one device and try to play some online multiplayer. Now, if I had Google Fiber...I would love to have twenty simultaneous streams!
They are probably right that not many people will upgrade to it, but good for those who need it. I have only run into the problem a few times when a roomate is watching somehting on my xbox, and my wife is watchign something on my ps3 and I am trying to watch something on my laptop while away it is rare enough that i doubt I will want to spend 1.5x what i do now, but who knows mayeb one day it'll happen and i will remember i cna upgrad emy account and just do it