How long it will take for all of those people to realize how inferior the original game boy design actually is, and how lame is to have only a single analog stick preventing you to play any first person shooter with mouse look.
I feel the same, but at least this is one of the few with 6 face buttons SEGA style...
For me the perfect form factor would be a GameGear case with round D-Pad (like the original one), 6 face buttons (2 of them should have the same functions of R2/L2, that will be present too as triggers), and all the other buttons/sticks present in an XBOX/PS2 controller.
All the ports should point to the upper side of the device, so you can plug every type of thing without having cables inside your hands or punching your belly, and you still can rest the device on a table while playing.
Oh, and 2 speakers for stereo.