@Kronos: if Amiga is to make success in market, then strong brand is a MUST, if you start making brand with cheap devices like those thing-in-joystick I doubt it will ever reach Apple or even smaller VoodooPC, Alienware brands...
@Tomas: In short therm, it can be success, but I doubt it would sell good enough. Tulip has good selling channels while Amiga has 3-4 dedicated shops in world.
There are many other 'cool' posibilities to make the same retro machine and not to make it cheap junk.