The situation with Roland is right across their entire keyboard range, in my view.
The problems started with the Fantom G really, maybe even earlier. The market was expecting something pretty big, and Roland delivered a real dud!!
They lost a large slice of whatever work-station market share they had to Yamaha after that debacle. Not that the Fantom was a dog, it was just it was mostly only re-hashed older Fantom technology with some new PC type operations.
Same can be said for the Sonic Cell. I guess the only bright light was the new Juno series which were, and as far as I can see from forums, still are, quite popular.
As the dollars dried up from their Pro keyboard markets, I think this equated to less $'s going into more R+D for the arranger division, already suffering BIG-TIME following terrible sales of the G70 and then E80.
Roland tried to recover a bit with the release of the cheap GW7, then 8 and the Preludes in an attempt, in my view, to generate some much needed cash flow into these divisions.
Again they fell flat as these keyboards, really, offered not much new to what had gone before. Certainly not enough to entice back those buyers leaving Roland in droves.
I think Yamaha placed their product at both the perfect price-point, AND the perfect marketing time to take advantage of the weak Roland position, and they (Yamaha) have been proven to be correct in this market assessment.
Personally I believe, there will be no further "serious" Roland arranger as we know it.
I even doubt if there will be anything but cheap alternatives to the Casio lines.
Until Roland gets its Pro Keyboard, and by that I mean Work Station, market share back with something really, REALLY special, then it's dismal times ahead.
However, I also believe the Cakewalk/Sonar, Edirol, Boss, and all the audio hardware divisions of Roland are doing quite well and will continue to do so.
Just my thoughts, for what its worth
Dennis