Just to the OP's point, Nintendo not dropping the Wii U price for last holiday (officially) was more of a tacit admission that they've given up on the system.
If they were seriously planning on supporting the system robustly into 2017 ... they would have cut the price to boost the userbase and give their 2016/2017 Wii U titles a chance.
And no, the system is not "selling well", I don't know why some people live in a bubble, it had a horrible Christmas holiday season this year (again) in the US and Europe. Japan was OK, but it's not going to sell more than 3-4 million LTD there no matter what what Nintendo does, which is mediocre.
They're not dropping the price because they know the system is a flop and the only thing worse than a flop of a system is a flop of a system that loses them money. So they're basically maximizing the most profit they can get from the Wii U because they know they won't be selling very many more of them.