Don't see that happen. I'm expecting the follow-up to the Wii U in about 2-3 years at the earliest. Right now, there are still tons of games in development for the Wii U. and the majority of their studios is focused on Wii U development (with the exception possibly being those that just released their latest project). After the software droughts for the 3DS and Wii U in their first years, it would be truly stupid for them to launch yet another system without a more stable launch window, so even though they are most likely already doing R&D on their next system (these things take time, after all), until they can reshift their ressources (which should be late 2014 to early 2015), we shouldn't be expecting more talk about it.
Also, even if they were going for a powerful system, why on Earth would they release it 1-2 years after the PS4 / XBox One? The only way a move like that could really hurt is if they wait at least a couple of years. That way, they can put together significantly stronger hardware at a relatively low price. By Nintendo standards, the 350 deluxe Wii U was already very expensive (and I don't think they would have ever gone there if it weren't for the cheaper basic model). There is no way they are going anywhere near 400-500 with a single SKU.
Above all else, though, I dont want them to abandon the Wii U just yet. I bought the system almost a year ago and have had my fair share of fun with it. I am also excited for the games that are yet to be released on it. No ambassador program in the world can make you forget paying several hundred for a box that was abandoned after a mere year on the market. I feel like more people ought to give the system a chance, because it is far better than its mediocre sales would have people believe.
Right now, the Wii U's performance my be hurting the company, but I'd rather see Nintendo ride this one out for another few years and use that time to really have everything come together for their next system. Rushing out hardware now can only be a recipe for disaster.
Edit: It might also be a good idea to hold off on all the negativity until we know how many units they'll have sold by the end of this year's holiday season. If the trend observed at the end of last quarter is any indication, sales may very well be picking up quite a bit.