Hate to say it (and expect to be flamed) but I'm thinking Patcher is pretty much right for once.
Nintendo said for years the next Wii would not be 'just HD' but where DS and Wii introduced all new types of gameplay, Wii U does not. Or at least it's not really obvious. People have been playing with touch screen since the DS came out. So Wii U's offering of an added touch screen and only slightly more powerful than other HD consoles leave me wondering who their market is. Wii U should have come out in 09/10. It would have seemed exciting and new then. Now.... it's old hat before even launching. Hopefully they'll have some awesome software that reignites the public's imagination.
3DS is selling strongly now, and I'm not convinced Patcher is 100% right on that front, although the people the DS brought in with Brain Age and Nintendogs are likely lost to ipads or at least are now conditioned to paying next to nothing for games making a 3DS a very hard sell to them. However, if 3DS can capture much of the PSP's former market (Monster Hunter) it'll do fine.