How about just writing to yamaha with your well reasoned arguments as to why you feel a 76 key true arranger would make them more money than their curenyt offerings or getting a petition together of all the arranger players you can muster from every arranger forum you can to put together a collective petition. surely that has to be more productive than bringing up this same discussion over and over again.

When i wanted a DVD tutorial for the Korg PA Arranger series i contacted korg to see if they would make one. when i got no luck i asked the forum members at Korg forums if they would pay for one , how many would wish to contirbute in making a DVD what price, who to approach for the demonstrations etc and discovered there wasnt enough people who would want one to produce on a commercial basis for Korg so we made the DVD's ourseles .
http://www.korgpa.com/pa_root/en/support/arranger_secrets.htmlne . It became the most popular arranger instructional DVD at the time (might i say only) . Even though Korg didnt see the interest , we did .

We sold over 500 of them, and i posted personally about 200 from my living room ! It became too much work and we placed the distribution responsibilities with other agents. They are still selling.

The point i am making is if you feel so strongly about the need or desire for a 76 key yamaha tyros arranger please stop whinging and do something constructive. Garner some support for the idea, present a commercial reason for them to do it and then let them tell you personally NO if thats what they choose to do.

If that doesnt work then the next best thing would be to talk to a smaller company like liontracs and see what they might do in terms of exactly what you think would be a yamaha beating 76 key arranger. If not them, then approach ketron,or roland or whoever but do something constructive !

Point scoring here might help your ego but nothing else. Nothing else !