Some thoughts:
While 3rd party support is indeed vital to any console, Nintendo is far less reliant on it, compared to the other two. N's success is primarily on the strength (or lack there of) of the games it provides. 3rd party support is... well, supportive to that, prolonging the life of the system. SNES and the DS are a testament to that.
However due to its' limited workforce (they are expanding now and for the last couple of years though...), the transition period to the U, as well as the need to supply the 3DS in the same timeframe they haven't been able yet, to give a lot of meaningful 1st party support. Another big reason is their obsessions but that's another talk altogether.
IMHO and i've said it before, Nintendo has to CREATE an audience for these kinds of games by providing similar content itself. I mean there's loads of cheap talent available in the West Retro growing and Next Level Games, NST etc. are fine and all, but they need to make a team, to develop western oriented content like a WRPG, a competitive fps, a realistic racer etc. If those are successes, then it will be proven that there is an audience for those types of games on the system and 3rd parties will be more open to the idea of giving the U similar games.
All in all it's not impossible, I mean look where they were at the indie front 2 years ago and now they are though of as the most indie friendly of the big 3. Moreover, 3rd parties are facing increasing difficulties, desperately seeking new ''business models'' and ways to suck more cash by the hardcore. They would port their high budget games across the board.