Although it's a good idea, I think there are several pitfalls in the Gameboy Cube. First of all, if it could play GC games, then it would have to have all the buttons that the GC controller, this could be uncomforable in a handheld system. Secondly, all the text in GC games would appear way to small, and the screen would have to have the same proportions of a TV screen. Thridly, having space for both cartriges and GC discs, aswell as the hardware requred to read them, would make it bigger than it needed to be. Fourthy (is that even a word?), Nintendo already is selling the GCs at a loss at 100USD, it would be much more expensive to cram everything into something that's just a little bit bigger than a GBA. Lastly, this would cannibalise the sales of the N5 to some extent. I know I would certanly hold off buying an N5 until a price drop or so if I could still be buying top qualitly games for my GC when it was launched. That's just what I can see though, who knows what would happen?