Rumor/Speculation/Conjecture - The NSwitch will outsell the WiiU the 1st year.

[Miyamotoo]

Selling more than 13-14m in one year would be very hard, but selling more than that in two years will not be problem at all.
So I say Switch will sell more than Wii U LT numbers in less than 2 years (end of 2018).