I didn't say it would be a runaway hit, I just said it would probably win. The masses, as you put it, aren't into spending a lot on consoles. Every console in the history of gaming priced over ~400 dollars (in today's money) has always been a flop. Neo-Geo, Turbo Grafx, ect..... The ps3 would have been a flop if they hadn't started a series of drastic price cuts. Even with that it placed dead last. If it were around 400 for the deluxe model then I would say they are ok, but 500 for the basic package, that's just insane. Also the new white deluxe model that Nintendo is working on is rumored to have a version that doesn't come with a game for only 300 bucks, so that makes it a full 200 dollars cheaper than the competition. So price alone. Well that and the fact that you can buy Wii U games and you own them.. you know, little differences like that.
The Wii U is the best console Nintendo has released in quite some time, I suggest you give it another look. You look at the specs and features and on paper it seems ridiculous, until you actually try one. The fact that you can ask for help on a game in real time, on the console, or check gamefaqs or all these other things make "hardcore" gaming that much more streamlined. Of course that doesn't make any mention of the touch screen usage in game, which ranges from ok, to fantastic. There aren't a ton of games atm, but they are coming. Unlike the competition, there are certain titles you are guaranteed to get on a Nintendo console.... Metroid, Mario, Zelda, ect... For me, that's more than enough to justify the purchase.
If you are a 10 year old or knocking 70+ and want to play with the grand kids. Not for professional gamers or those with disposable incomes that can justify a purchase of not only one capable platform but both Sony and Microsoft offerings since Xbox or PSX. Our spending power generates top notch games, considering how many 18/Rated R games have come out and the COD/BF3 adult markets. I haven't seen many teens run to the wii for safety. Getting into the thick of it is our nature and those consoles provide the means.
Something that the poor pew pew Wii cannot do with it's off the shelf processor and parts and bland aesthetics, nor its close cousins that have seen some poor press as of late. Putting lipstick on a pig....
Nintendoh has its market, and its following. Perfect for the above demographic and, as parents tell me, the choice they feel comfortable with little billy, sally, and gramps playing together. Not sure if that includes geriatric adventures that result in back injuries and slipped discs. Sit my parents (they are getting on) down in front of the Kinect and they can control the 360 dashboard experience. It just works. The PS3 and my tech illiterate brother after some prodding with a sharp stick -

(finally) "just works" and he is happy as Larry.
Put them all in front of the wii and the unsteady hands throws the experience in the trash. Try playing Wii Scrabble with the dithers....
The wii now sits next to the TV in the spare bedroom (for netflix) gathering dust.
Times have moved on and Nintendoh is experiencing what Apple has had of late:

That is the reality of the wii. Not the mystical instrument Howard paints, but a device that suits a specific demographic that is moving on. And really - that should be enough to bury its existence. Mind you there are the handhelds that are keeping Nintendoh afloat, but we won't go there, this time around. But it echoes my point.
Yes they sold a few units, but that is why I can pick up an used Wii for £30 with a few games and I have to fork out £90 for a 360 and £130 for a PS3 without a game. Go figure.