Niche B-tier title selection on Wii is horrible. Even the stuff on the HD consoles, diminished as it may be to the portables compared to the PS2-era, absolutely tears it apart not even including download services.
It's like these little straw-grasping lists are made by people who have never gone outside of a Nintendo console, not even to a portable before. The only thing the third party output, niche or otherwise, on the Wii stands up to in any regard is the Gamecube or N64.
On the actual topic, I really, really don't think we'll be seeing full blown games equivelent to Epic's tech demo for good while after the next line of consoles launches. I think it'll be closer to what we have now going into the twilight of the generation, but with the ol' PC touches on them. Budgets and asset creation are just getting too high. There was a good bit on The Cruncheons podcast recently about the diminishing returns of it all that I really thought was quite logical.
Nintendo is going to wind up dated as the years tick on though, still, but on the nice side of things with the build theyre going for and said diminishing returns they will at least wind up in a hell of a lot better position than they did with the Wii.
I still don't think they'll get many more original titles or attract the original B-tier devs or indie scene with their quirk away from the typical outlets, though, I just think they'll get back to having a more Gamecube-like presence in actually seeing some of the multiplatform titles.