Dont forget for every AW sold to a pro or semi pro there are hundreds sold to home users. Also, not all musicians who gig want more than 61 keys anyway and if you do there are Korg, Ketron, GEM and Roland offerings already out there.

It doesn't really make economic sense to tool up for such a limited marketplace.

I would be very surprised iy Yamaha bring out a 76 note keyboard as much as I wouldn't mind having one myself.

Just my 2 peeeees worth

KF