I think Nintendo not dropping the Wii U price is another tell tale sign they've given up on the platform.
If they're serious about this being something they're going to back for another two years basically, they'd be trying a lot harder to increase the userbase in a meaningful manner.
Instead it seems they are content just selling the same low 3 mill/year Wii Us each year and aren't willing to cut the price because they would incur unnecessary losses. They don't believe in this platform at all.
They've given up on this system. If they were really behind it they would be aggressive in cutting the price like the 3DS or how Microsoft is fighting tooth and nail for the XBox One. Nintendo? Doesn't give two craps about the Wii U, they were willing to fight for the 3DS, but with Wii U once the casuals didn't show up, Nintendo knew they were fucked for the generation.
They are just riding this thing out now, they know they're only going to sell a paltry 14-17 million and they've known this for a while, they're not willing to cut the price other than some "flash drops" for a couple of weeks over the holidays but that's it. They view it as a failed platform and are just hoping to recoup the maximum amount of money from the core Nintendo faithful willing to buy it. That's why it's stuck at $300.
Not cutting the price just means they think it wouldn't increase hardware numbers enough to justify the cut. Wii U may or may not get replaced this year, but it's lack of a pricecut has nothing to do with "nintendo giving up on it".
I think these are two seperate issues. Whether NX comes out this year or not, doesn't mean Nintendo hasn't given up on the Wii U. They have.
If you want to see them fight for a system look at how hard they fought for the 3DS.
Compare that to the Wii U. They know it's a failed system so they're basically just letting it kill itself. They're not going to help it by throwing a life preserver (a price cut), they're just gonna let the thing drown.
Game development on the 3DS successor at the very least probably started in 2014, it would have to in order to make a 2016/17 launch, that's more than likely what they have focused on primarily.
If NX/3DS successor are not ready for this year that's more of a product of Nintendo always being late for everything, not so much that they're working on all these big Wii U games.