Maybe and maybe not (that is certainly not why I have a DS) but seen as this is a business thread the question was (after a fashion) "is such a scenario enough to sustain Nintendo or better yet have them shine with the present setup?".
Well it has been enough for most of their systems hasen't it?
I may be wrong. The WiiU may fail catastrophically. But at least it tried to do things a little bit differently, without resorting to the same old Call of Duty and GTA games.
I'm an avid Nintendo fan, and yes I will continue to buy Nintendo consoles. But to say that Nintendo fans don't buy Nintendo consoles to play GTA and the like, while technically true, is a bit misleading. Of course we (at least we who are willing to face the reality of the situation) buy the Wii and Wii U (at least today) mostly for first and second party games because we know most AAA third party games won't make it to Nintendo's console. But that doesn't mean we don't seriously wish they WOULD. I don't know about you, but as a Nintendo fan, I'm sick of having to pop down $700+ for two consoles just to get my dose of both Nintendo and great third party games. When the Wii U launched, I was hopeful that I would only need one system this generation, but now I'm resigned to the fact that this almost certainly won't be the case.
Which leads to your PC example. So many people don't own gaming PCs, so even if they did go that route, that's still technically a second gaming platform that they have to spend money on aside from Nintendo's console. Sure, maybe that situation doesn't apply to you and select other people who like Nintendo and already own gaming PCs, but it sure as heck applies to many other people, myself included.
I do understand your concern. However I believe the mistake you make, is to to expect that you can play everything with a single system.The way I see it (unfortunately) that will never happen.
Let me put it this way:
While you like the play the big name titles such as those I named before, why are
you a Nintendo fan then? Why do you keep buying their systems?
I believe that may be due to something. All in all, you need your "Nintendo" dose. Exactly like me. So they must be doing something right. I think that what they are doing right, is exactly that: offer something different from the rest. That was the case with the Nintendo DS, that was the case with the Wii, and that will be the case with the WiiU.
Also, before things start to go this way, let me tell you all right away, that I'm
NO Nintendo fan. They have done a lot of things that annoy me and still do. I would also like "Battlefield" on WiiU so I could blow some heads up now and then. But I already know, Nintendo generally does not "swing" that way.
As such, I keep my PC for that. Also, my computer is not a gaming computer. I have a simple desktop. I just buy a sufficient powered graphics card, pop it in there, and I'm good to go.
So even in monetary terms, it is still a better choice since I have a fully functional computer for all my PC needs,
AND a gaming machine. So even if it costs 200$ or 300$ more than a PS4/XboxOne, don't forget that it does what they do, better, and all the other computer related tasks too such as work, internet, etc.
To
my eyes, and to a certain degree, a PC + WiiU, "eliminates" the need for a XboxOne / PS4.
Of course if you like titles that only PS4 or Xbone have, by all means, buy them.