It's far too early to call the current gen winner. There are too many unknowns for the next year or two before things will start to look like they are settling in place.
(For example if the PS4 got a long way ahead of the PS4, MS could knock 50% off the MSRP of the XB1 next year and suddenly find they become the top selling system by a mile) Nintendo might decide £99.99 is the price point for the Wii U, and bundle Mario Kart and Mario Galaxy 3 or whatever with the Wii U along-side releasing a huge new Zelda.
As for PS3 catching up to the Wii, maybe, but I don't see it personally at this stage. I think the 360 took too much of it's userbase to be able to finish ahead of Wii now.
RIP Dad 25/11/51 - 13/12/13. You will be missed but never forgotten.
