What will happen if the Wii had HI DEF and still had motion sensors?

 It would cost more, and would be bigger, due to the greater power, and cooling, demands of a system currently powerful enough to handle HD.

It would cost a shit load more and wouldnt appeal to its current userbase because of it, the PS3/360 userbase is somewhat anti-Nintendo so it wouldnt appeal to them either. Basically it would be less of a success than it currently is. Maybe a Wii2 with HD would work though as it would carry over from the Wii's fanbase.

it would cost more to manufacture, cost more to develop games for, causal user probably won't buy it and it'll be in direct competition with xbox360/ps3

I would buy it? :P

PS2 was 720P HD Capable on some games If i remember right, and i KNOW XBOX 1 is. That means, the Wii is TECHNOLOGICALLY Capable of HD resolutions, and i have no doubt we will see a developer create a game in a resolution of 720P by the time 2008 is out.

It would have been more expensive, it would not have sold as many systems as it has, and I would have gotten a PS3 instead.

DonWii, im certain you are wrong, XBOX was capable of HD, and im sure you will see in time, Wii is too.

Definitely. If the Xbox could perform at 720p, then the Wii should be able also be able to perform at 720p in the near future, since the Wii is technologically superior to the Xbox.