I'm feeling the same way, and have been for a long time. I love Nintendo, but as time went on this past year, with hearing stuff like Wii is not going to be able to do HD, not going to be able to have 5.1 DD, just a souped up GC with no new shaders, and a controlelr which is interesting, but ultimately flawed for many types of games, and to top it off, the higher than expected price tag and controller prices with what seems to be a lame online system (friend codes again wtf?!), I can't really support them like I did before.
Zelda: TP looks ****ing fantastic on the GC, but there are games that have been shown for 360 and PS3 that look far better, and it pains me to realize that the next Zelda won't be able to match those games because of far inferior hardware. Yeah, the gameplay will probably still be excellent, but who wouldn't love a new Zelda that looks like Kameo, with HDR, dazzling water effects, parallax mapping and all that good stuff.
I will definitely be getting a Wii for Zelda, Mario Galaxy and SSBB alone, but these are the only worthwhile things I see for the Wii right now. Much like how the N64 seemed like a far better console when the GC came out, so too does the GC look better against Wii. :/