Asking users is in fact the worst response, the proper response is not to listen to your customers, but understand the reasons a customer buys something, or doesn't.

Too many incumbents listen to their customers and then get sent in the very wrong direction.

Listening to their sw houses and developers is also wrong as those are the same developers who put them in the position to be disrupted and most of those devs are getting disrupted as well.

Resources will not help them Alb, in fact resources will likely hinder them in responding correctly to Nintendo, often times its the less resourced dsiruptor that destroys the well resourced incumbent, because the incumbent for all their resources lacks the processes and values to understand the disruption.

Nintendo is already fighting, and winning, but there is nothing that shows that Sony and MS can counter Nintendo's battle plans, so there is little reason for Nintendo to change plans

^^
Asking users is obviously oversimplifying a wider process of studying existent and potential market, nevertheless it must be done too, as it often helps clearing some issues (*).
And about SW houses, I wrote about asking the most dynamic and open to innovation ones, although reassuring the most conservative they'll have adequate dev tools to make good use of new features and that nobody wants to disrupt them, but opening them new unexploited markets and making them disruptive, not disrupted, could help a lot, marketing must not always mean swindling people, if there are concrete ideas behind it can be actually informative and constructive.
Nintendo, having a so strong SW division, is in a different position from its HW competitors, it owns dynamic developers to ask, but Sony and MS would better ask also selected 3rd parties, because not having in house the same instruments as Nintendo, they must complete them.
Finally, Nintendo hasn't to change its plans, at most fine tune some particulars, but simply avoid lowering its guard or resting on its laurels.

(*)Edit: Although you are right about the risk of being misleading, for a simple reason: as most hardcore gamers, with tastes often quite different from the masses, are more likely to exhaustively answer polls, the sample will be quite biased and answers will need to be adequately weighted and filtered. Not doing it the result will likely be similar to letting an engineer write an instruction manual aimed to housewives (and so making them desperate ones  ).

Even the most open to innovation and dynamic SW houses have been of little help to Sony and MS this gen, and have shown little progress in getting better, maybe it speaks poorly of the industry as a whole, but its there, so it won't help them.

No actually asking users will net them the wrong answers, users will ask for better internet, better graphics, etc. things that have not mattered to the Wii. You have to understand consumer behavior, not what they say they want, because they'll always say they want something they won't use.

Sony can rip off Wii Sports and give it some sort of Play, Create, Share twist like they did with LBP (rip off Mario) and Modnation Racers (rip-off Mario Kart). That would be really great to see!

So you agree that the Wii is neglecting the "core" gamers in favor of the casuals then I suppose?

^People wouldn't be interested, since the Wii already has those games

What does you mean? What people and what games?

Yes but not all the peoples have the Wiis.

Not actively neglecting, but rather that the values of the Wii and Nintendo's strategy were more appealing to the downmarket, the upmarket core being those that care moreso about graphics and narrative being more appealed by the 360 and PS3 incumbents, of course as with any disruptive innovation, as the incumbents cede more and more downmarket to the disruptor by moving more upstream and focusing on their most loyal customers, the disruptor moves more upmarket

They would buy the Wii if they wanted those games