No. Just...no.
First things first: that 2 player splitscreen Galaxy video IS amazing, hands down. Rendering 2 different images like that...I don't know enough of programming how they did it, but I guess it's with some HUGE coding involved. Also note that it hasn't been released yet. I doubt it's anywhere near stable enough for releasing, and with the wii's processor, it would surprise me if it WOULDN'T involve cutting some details in order to keep the framerates in the double digits.
If I understand side by side 3D correctly (
random linky), you'll have to render each image twice. That in itself isn't easy: since the wii was nowhere designed for it, it would probably just double the amount of resources needed. Which is not only something that is undoubtedly far more complex to do than it sounds, but the results will drain the GPU and CPU into a crawn on any game more powerful than wii sports.
Second: you don't just want to render the same image twice (which would yield no result). You want the second one to be positioned
slightly different.
And that's the part that's just impossible. Yes, riivolution can replace textures. But in order to create 3D, you'll have to retain that slightly different position in any angle.
Here's a test. Take any random (virtual) picture. Make a copy. Now alter that picture in such a way that, if you put both pictures together and you look at it cross-eyed, it springs out in 3D. Not easy, huh? Well...then think again: in order to make a 3D
moving object, that was actually a piece of cake (relatively speaking, of course).
So: no. Please don't take offense, but that wasn't a smart question. The amount of work and processing power plain out make it impossible, even for a professional team. Just asking if someone could do it would be analogue to asking if someone could plain out write and compile a windows-replacement for five bucks*.
*yes, someone actually asked that, once.