Donny,
Why do you think that day is not here Now?
To be good it does not have to be from Yamaha, Korg, Roland, etc.

All those guys could do it NOW...and before now...all they have to do is keep the HW box and change out the SW.
They would need to design it for that route...and they will not because...People are still willing to lay down big $$ for new keyboards.

Think of it this way...what is PHYSICALLY different on the last 5 keyboards you have bought??