I'm not saying 4K for gaming, I'm just saying that the "human eye can't see past 1080p or 60FPS, etc" is complete garbage. If you have a CRT monitor, set it to 60Hz, then 75Hz (or 85Hz) then 100Hz, if you can't see the difference then you need to go see an eye doctor.
And again, for Mop It Up this time, 1080p gives you 2.25 the definition of 720p. The difference between 720p and 1080p is not smaller than the difference between 480p and 720p, they are literally the same in terms of difference.
But of course outputting 720p would not make the Wii anywhere remotely as powerful as the PS3 or 360, but giving it a little more VRAM and a larger framebuffer would have made the games that were on it look a lot nicer.
On a side note, I've been tempted lately to get a new 70"+ TV since they are so cheap now...but I'm gonna wait until 4KTV takes off, because I can see the difference, even on my 52" from 10 feet away.