Perhaps that's only part of the logic we use for defining "next-gen": the DC, GBA, PSX, N64 and Saturn all pose a challenge to emu authors, whereas for GB(C) there are loads of emulators which more or less all look alike. Also, the GBA/PSX/N64 scene is a lot more active than the GB(C) one, and we're hoping for the DC/Saturn scene to become the same. The GB(C) scene has already had it's active period..
.. and why make a GB(C) forum for the boards when NGEmu doesn't even cover it?