A bit of a daft question tbh. Going by the Nerd-Rage seen on boards all over the place the One will be lucky to reach GameCube sales from the 6th gen. Unless Microsoft backtrack on their used games policy the One is going to flop. Hard.
The only thing that's going to do the One any favours in terms of an installed userbase between the two systems is that the PS4 (as with the One too) is going to be supply constrained so will probably only sell around 1.5m before the end of the year, and definitely won't do over 2m.
I still can't believe that Microsoft have fucked this up so much tbh, the One could have the best software collection since sliced bread at E3 but it won't make any difference unless they drastically change the used-game policy and change the Kinect device always being on.