Sirius87 on 12 February 2014
Of course the lifetime sales depend a lot on the length of this generation. I expect a new Nintendo console by 2017 and Sony will follow 2019 (if still existing; otherwise Samsung will release a console). MS will drop out of the console business shortly after. I also think that we will see a rise of playing via stream at the end of this generation, and my numbers don't include pure streaming-devices/"consoles". So here's my guess, based on those assumptions:
WiiU: 25m
PS4: 130m
XOne: 75m
