Wii U sales will explode with the release of Mario Kart 8, Smash Bros, Super Mario 3D World, Wii Fit U, and Wii Party U. So I expect Wii U to outpace PS4 for 2-3 years and actually increase the WiiU-PS4 gap (in comparision to whatever number it is when PS4 releases).
However I think Wii U, like Wii, will die out a bit early. I also think PS4 will outsell the One by a hefty margin, and sales between the two platforms won't be 1:1 like this gen. With that in mind, I think PS4 will top Wii U sales when they reach about 65-70 million units.
So maybe in 4-6 years? (2017-2019)
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