Let's see...take a DS Lite, strip away GBA functionality rendering the features of some games totally gimped (Pokemon games) and other DS games totally unplayable (Guitar Hero), then add a camera with worse quality than can be found on free cell phones, and DSi downloadable games that promise to be ridden with shovelware. Oh, and then charge $40 more than the DS Lite for it.
Nah. I don't plan on getting it. I'm happy with my Lite, and unless Nintendo starts pushing out some really compelling DSi-exclusive software, I plan on sticking with the DS Lite even if I ever need a new DS.