In all fairness Nintendo reported that WWHD has sold 1.69 million copies as of December 31st, 2015.
I know there were copies bought for free with MK8 but that's still quite the good number for a Wii U remake.
If the new LoZ is as good as we'd hope and launches before an NX port it should sell at least 2.5 million, but I would think closer to 3.5.
An NX port or remaster or what have you could sell bucketloads if the system becomes a seller.
As for my guess, it'll crawl to the finish line as a 10million seller with both versions (high hopes but that's what guesses are for :D )








