Personally I think the market is full of enough things. Live entertainment is evolving and actually playing an instrument is being pushed aside with the spotlight on vocalists. Its been said before, for most venues no one cares how the music is coming out as long as its good and the attention is all on the singers. Last Friday on the Today show they featured another flavor of the week new band. Behind the singer I noticed some classic Fender amps. Nothing plugged into them and the whole act was done to pre-recorded tracks. The drummer did actually hit some drums but I guess he couldn't fake that.
Milli Vinilli was ahead of their time.
If a situation calls for a live act as in Jazz or Classical then it needs to be totally live. Even if its just a piano player in a restaurant. Just play the piano, thats whats expected.
For the rare occasions that will allow some arranger playing I think there is enough variety out there to cover it. I'm really happy with my BK9. It does all I want or I think I will need. I think Roland realizes that too, how much do you need to justify the selling point. Would I like an Audya, sure, but would it justify the cost, no. For the hobbyist who wants the greatest, sure.
I don't think young musicians really know much about arranger as there are numerous keyboard that will just provide bcking tracks and recording so they are pulled toward those.