Worldwide I don't think any US console will have a chance (Japan is too big) for a while, unless Korea & China become big console markets.
I'm somewhat surprised, but then again, everyone expected the Wii to forever and ever dominate the US market last generation. I think it ultimately outsold the X360, but X360 won a couple of years in a row over it. I would probably caution far more patience in the "who will sell the most in the USA" victory laps / defeat drinking for a while now.
Hell, if Sony or MS snapped up something like, NFL Sunday Ticket and put it as an exclusive on their console, that could swing the sales completely one way. I suspect it will come down to the next two years' worth of games.
Remember, Games > All when it comes to what wins a console generation. (I exempt the NFL from this, because the NFL currently crushes everything in existence in the USA).
My bet is still that PC ends up winning this generation and being the dominant gaming machine. The similarity of the console designs to PC architecture as well as PCs probably getting many of the "exclusives" (see: Titanfall) + having their own exclusives makes me believe that PCs will sneak ahead. Kinect being a killer app might have made sense once upon a time, but the explosion of development costs & expectations for gaming have put a severe crunch on making great Kinect required advances in gaming.
Also, had the rare opportunity to meet both Spencer and Satya in the last couple of months (personally, not professionally). Both seem to be fantastic choices for what they are doing - they both are passionate folks.