1: No, not really, they're both heavily down yoy and will be down even more come fall/winter and this holiday season is bound to be quite a bit worse than the last one saleswise. The PS360 combo has been down around 20-30% thus far in 2012 and this percentage will grow bigger through the year and at this point, a price cut will have much less impact. The incoming announcements of their respective heirs will also damage sales even further, the Wii pretty much died after the official Wii U announcement and keeps falling (been clocking in at over 40% down yoy for 2012).
2: I agree somewhat. The problem with the Wii U as I see and the main reason I don't think it will ever sell as much as the Wii is that they seem to be targeting both, which is practically impossible for a multitude of reasons (feel free to ask and I shall name them).
3: The price might get hiked up by the cost of the controller and one can imagine the cost of extra controllers and peripherals, Nintendo are known for having the most costly accessories in the biz. The price of the console itself; hmm, there is nothing to suggest that the Wii U will be massively powerful and thus require a high production cost, if the PS4 and 720 are able to be priced within some semblance of reason, there's no reason why Wii U shouldn't be able to beat that by a little bit. Will they make a profit? Who knows, we don't know the retail price but we know one thing; price does matter, a high entry price paired with costly peripherals is a bad idea. Expect an introduction price of around 299$-349$.
4: Despite probably lacking the horsepower, the Wii U will be capable of full HD, full shaders and real-time rendering and most filters and effects as the PS4 and 720, all be it at a lower level. Its still a lot better than the Wii which had a very different architecture and was almost impossible to include in cross-platform development. All in all, Nintendo are better of in this area than in the 7th gen. Add the fact that the power leap will likely be smaller from 7th to 8th and that the generation itself is more likely to be cut short than this one and its not so bad.
5: This is a tough one. It seems that Nintendo are hoping and thinking that they'll be able to go toe-to toe with the 720 and PS4 as far as 3rd parties are concerned and that this will magically lure the more dedicated gamers back to their platform. I don't think they can achieve this. What they need to do is focus more on aquiring talent in the form of 1st and 2nd party developers and also show some breadth and depth and produce 1st party fare outside of the standard Nintendo franchises which aren't about waggling about in poorly rendered sports, cooking, quizes, petting dogs or any other trivial activity.
6: Here I pretty much disagree, the console market will remain largely unaffected by the mobile/tablet games market. The whole craze is not sustainable on a global and all-encompassing basis and the only ones who will feel the burn properly here are the handheld consoles, its already beginning. The 7th generation saw a massive expansion of the market as well as the rise of mobile/tablet gaming simultaneously, this is in itself proof that both can and will live together and as seperate entities.
Now, to your main, overarching, point; am I worried about the future of the Wii U?
Yes and no. I think it could be great but also think Nintendo need to focus on one direction and commit fully, they're branching off and trying to do something that could prove costly by trying to build a hybrid platform which will entice equal parts casuals and core gamers, the whole shebang could very well end up alienating both.
I honestly believe that it will do well, I do, but not exceptionally well. It won't move nearly as much software as the Wii, not even 1st party titles and it will end up selling a lot less than the Wii, perhaps a little over half in lifetime total. Furthermore; it will write history by becoming the first direct sequel to a market leader that didn't win it's generation.
History does not repeat itself, this generation should be living proof of that and the gaming market has become a fast-moving rollercoaster that you can't command but simply need to cling on to.