I had a phone conversation with Yamaha a while back, and they said that basically, the 9000pro 76 sold in such low numbers, and most other 76 arrangers sell very poorly compared to 61's or consoled up 'home' 88's that they honestly have NO intention of producing a 76...

We few pros and gigging 76 arranger players are such a drop in the bucket, as far as Yamaha are concerned, they don't even CARE that we HAVE to go Ketron or Korg or Roland even if we DID want a Yammie in the first place...

But anyway, at least we can be grateful that a FEW companies care more about what their customers actually WANT than the almighty bottom line...
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An arranger is just a tool. What matters is what you build with it..!