Well Wii hardware is typical previous gen fare after all. The original XBOX had similar specs 10 years back and it was discontinued the same year Wii was introduced. A 729MHz Single core CPU and a 243MHz GPU (capabilities unknown) is portable device fare these days, so I don't think its impossible. What's interesting and surprising is Nintendo choosing to do such a major hardware overhaul and then releasing it as a revision of Nintendo DS rather than as an entirely new line of consoles.