Don't know about this year, Wii could actually win, it will be close though. It wouldn't however be much of a victory would it? Apparently it takes a combination of two 'cutting-edge, hardcore consoles' to beat the simple 'underpowered, casual fluke of a console' . Anyway, we all know Wii was an absolute beast it's first three years which we'll probably never see again in the console industry so it's not much of a comparison to begin with.
Furthermore, to catch on to the other discussion, I'd say PS4 will end at Wii lifetime sales, a bit over 100m. Funny that there would then be three consoles at around 102m lifetime sales. I don't see this gen being as lucrative as the last, or last as many years, so I doubt the XBox One will get far above 50m if it will, maybe up to 60m at maximum, for a lifetime of this generation (minus Nintendo) of about 150 to 160 million consoles. Virtual Reality will fail, definitely won't entice the so-called casual gamer and it's not going to help PS4 in any significant way. Price-cuts lose their impact the longer it takes, but PS4 is however, simply the 'go-to' console this generation so it won't have much of a problem maintaining good sales.