Arranger buyers will always be the older bunch...there's lots of new buyers getting older...the companies adjust for that by adding new styles and features.
The organs were phased out because they were seriously outclassed by portable keyboards. I was teaching Electone at the time the new PS series came out....I was right in the middle of the changes.
In only a few years, they took over, and when Roland came out with the E-series, everything went crazy.
My average Tyros buyer is 55...I keep track; it's part of my job.
I agree with DonM in that there is little need to use a TOTL arranger anymore...the mid-line models have everything you need, and this way, it doesn't cost all that much to remain current with the latest technology.
The mid-range is where the profits are, and the Prelude and GW-8 need a few more features to get there, and be competitive...maybe they can add much with the OS...maybe not.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.