Seems like very few people get why the Wii is such an important platform, and the only reason why a game like Xenoblade Chronicles was made. Or atleast the reason I agree with.
And yes, theoretically it would perhaps be a more enjoyable experience on a HD platform since most humans want pretty things -- but that's besides the point that the existance of Wii let such a game be made.
On a HD console, they might start out with the same vision, but it'd eventually get compromised/changed (Perhaps by a publisher, perhaps by someone on the project, perhaps the natural progression of attitude/mentality of working on a HD project.) cause of the general human desire for better graphics, or focusing on a single, technological aspect.
If you don't believe me, check out a behind the scenes video with developers making a game for Xbox360/PS3, or an interview, or just take a look at the entire video game collection of those 2 platforms.
I'm not saying all the games on PS3/Xbox 360 are bad, just that the industry and public attitude of wanting the greatest graphics in each new game, every time, has definitely compromised gaming somewhat in general.
So, The basic structure of video game development and human nature prevents a game like Xenoblade Chronicles from being made on a HD platform.
I posted a longer post on this earlier but it's quite an interesting subject to discuss, so I thought I'd chime in again.