"The big difference is the new menu, internal memory, sd card slot, online
downloads, and the camera"
All of which will be well under utilized outside of Japan. Look at the DS as it is now, here, its got wifi, and yet that is often not used well, or not used at all, the touch screen aspect is hardly used, often its completely optional.
Online
downloads are great, but I don't expect to see too many quality
downloads outside of Japan.
And what good is the SD slot? To store your poor qulaity pictures using the gimmick cam?
The DSi will get the Games and content that will make it a hit in Japan, however for those of you outside of Japan you will be lucky to get a fifth of the content they do, as that is the way it has always been.