Wii U could get a small lead on Playstation/ Xbox as rumours suggest the new systems will cost a lot more than the Wii U (again!) But i expect Playstation to sell very well again, especially if it's cheaper than Xbox
Xbox One, PS4 and Switch (+ Many Retro Consoles)
'When the people are being beaten with a stick, they are not much happier if it is called the people's stick'- Mikhail Bakunin
Prediction: Switch will sell better than Wii U Lifetime Sales by Jan 1st 2018