I have to say no. HD is one thing, it wasn't as "mainstream" or fully developed when the Wii came out. 3-D will take even longer to be fully developed, and even then I don't believe it will ever become a "standard" in the sense HD might. There is still different "formats" and methods for home 3D and I don't think we are at the point where you can say one will stick over another. You can buy one of the 3D TV's now, but it would almost be like buying HD-DVD over a Bluray player back when those first were launched. Some even speculate Bluray hasn't fully caught on to the point where it will be the next big successor to the original DVD. Nintendo isn't foolish enough to jump into 3D on a home console.
DS is completely different, you will only ever play a DS game on a DS, it doesn't matter what kind of TV, speakers, or cables you might have in your living room. The screen and system are in one wrapped up package.
Nintendo is not going to assume about what you have in your living room when it comes to anything really new, they're just going to go with what has the most wide-spread compatibility at the time of release.
Btw, why all the "wii 2" talk this generation? Has Nintendo (like Playstation) ever slapped a 2 or 3 on a console? sure they slapped "Super" and "64" on, but even with 64 it reffered to the power of the console not the number of the console.
