PS4 basically outsold everything this gen and wrote history the day it launched.
XB1 may come close but I don't think it will catch it, assuming Scorpio ends up being tied into this gen.
Considering 3DS will continue to sell, and with the 2:1 sales for PS4 remaining fairly steady, and probably won't change all that much with Scorpio, PS4 would need to sell around 130 mil units for XB1 to reach 65 mil. I can see PS4 reaching 100 mil, but not 130 mil, which puts XB1 around 50 mil, give or take.
PS1 - ! - We must build a console that can alert our enemies.
PS2 - @- We must build a console that offers online living room gaming.
PS3 - #- We must build a console that’s powerful, social, costs and does everything.
PS4 - $- We must build a console that’s affordable, charges for services, and pumps out exclusives.
PRO -%-We must build a console that's VR ready, checkerboard upscales, and sells but a fraction of the money printer.
PS5 - ^ -We must build a console that’s a generational cross product, with RT lighting, and price hiking.
PRO -&- We must build a console that Super Res upscales and continues the cost increases.
