I think with increasing competition and less legs in the console market the PS4 may only be Sony's (main console) until 2018. It will end with about 90-100m in sales. Before I thought XB1 may only have about 30-40m, but the way it's going now it seems it may hit 50m, but I'm still waiting to see next Jan-Feb-Mar and see those sales to prove it. As for Wii U, I'm seeing about 35-40m lifetime
XBOX ONE/Wii U/3DS/PC
RIP Iwata 12/6/1959-7/11/2015
Thanks for all the great memories!