I think Nintendo's fine. Cutting WiiU's price SO soon would be crazy. And definitely very bad when you take into account consumer and investor trust and confidence.
Besides, another very important point you ought to take into account (imo) is that Sony/Microsoft's next consoles will be more expensive than WiiU currently is, presumably by a VERY significant margin.
So when those release, WiiU will suddenly look a lot more affordable, especially taking into account that by then it will have a very attractive library of big games appealing to different audiences (NSMBU, Wii Fit, Mario Kart, Zelda WW, 3D Mario, Pikmin 3, that X RPG, Game & Wario, Yarn Yoshi, plus 3rd party stuff like MH3U, COD, Lego City, Just Dance 5, Wonderful 101, Bayonetta 2, all most likely released or soon to be, by then).
And that's not even taking into account a lot of new games surely yet to be unveiled, and e-shop stuff.
Some people think WiiU's expensive, but when PS4/X720 come out, costing $400-$500, with a tiny library (mostly consisting of games that won't matter either, as with all new console launches, ever), WiiU will be in a very comfortable position, I should think.
And should Nintendo feel the need, THEN they could take measures. Like dropping the Basic bundle, and lowering the Premium WiiU to $299, offering it in black and white. This shouldn't cost them as much, and WiiU should be quite profitable by then, anyway. Such a move, a year after launch, would be very acceptable in the eyes of consumers and investors, and not tarnish trust and confidence. Doing it now, or in a few weeks/months, would, and not be seen as very acceptable. Imo.