This, and I think the whole meme that "Nintendo = nostalgia factor" is kind of overblown, and misleading. That's not really the entire point of a Nintendo console, but perhaps it's an easy way for people who don't buy them to rationalize why others do.
Nintendo's said multiple times that their goal with Wii U is to find a balance between mainstream and 'core', or hardcore, or whatever you want to call it, players.
Now, the thing I'm thinking is that they may have a very particular spin on doing that. It's not just about getting the latest COD and Assassin's Creed on Wii U. They seem to be coming out with quite an emphasis on the kinds of games that would have formerly been considered staples of core gamer land - Japanese action and RPG titles, original IP quirky games like Wonderful 101, and perhaps more that we're going to find out about at TGS.
To me this sure looks like Nintendo may have realized there is some dissatisfaction with current gaming on the HD consoles by a particular audience, and may be fishing to see if they get some bites. The interesting part is that the audience they may be going after, if this is true, tend to be the people who are multiplatform players.
I think you're reaching a bit too far there.
I think it's just Nintendo reaching towards what they naturally see as the "core" games - "core" Japanese games from companies like Platinum, Sega, and Square Enix. I think that's what they still think of when they ask themselves the question "what do the core gamers want?"
Remember, the current environment where the core console space is ruled by western studios has really only occurred in the last console generation. It seems to me like it's almost passed Nintendo by, or something like that. A lot of the biggest console developers this past gen are companies that were almost PC exclusive before roughly 2005 and have no working relationship with Nintendo. Bethesda, Epic, id, Irrational, Arkane, Valve, Obsidian, and BioWare have collectively shipped virtually no games on Nintendo hardware. They and Nintendo are probably still pretty foreign to each other. That's why almost the only western "core" games you're seeing appear on the Wii U right now are from the big guys who've always been publishing on console like EA, Ubisoft, Activision, etc.
Honestly I think this is Nintendo's greatest weakness when it comes to 3rd party. In the last several years a whole new environment of development talent has shown up that is completely foreign to Nintendo. Thus far we haven't seen a huge amount of effort from either side to get to know the other in business terms.
From Nintendo's relationship with Platinum and how they treat Retro, I'd like to think that the people up there making the business calls recognize talent and the actual need to foster it. Iwata himself stated that Nintendo probably won't buy developers outright anymore because he fears talent leak - something few other gaming executives even acknowledge. He even talked about it as part of the reason Nintendo put Retro to work on
Mario Kart 7 and
Donkey Kong. What I'm saying is, it would be a shame if that "eye" for development talent at Nintendo were to completely overlook the likes of Valve, Irrational, and the like. I'd like to see one of those companies establish the relationship with Nintendo that they have with Platinum.