Actually, I've been dreaming of something like this for a long time, and started a few disussions on this forum. Of course, it would be worth to learn an entirely new system *only* if a consistent part of the music community would agree to do the same.
But I'd love to have one, if only for my own amusement. Can you imagine? All scales and arpeggios with the same fingering! Transposing? A breeze. Large leaps, generally much easier.
Of course, it remains to be seen how well this particular brand of keyboard responds to one's touch, and how much it costs. From the pictures, looks like an elegant implementation, btw.