Well, the rumors of Roland's death have been slightly exaggerated, unless you are looking at TOTL only!

But yes, unless we can get kids more interested in arrangers than synths and WS's (and software), the long slow walk has already started. Remember, home organs took 20 years to fade to their now insignificance. If you are expecting some night and day event, don't hold your breath!
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An arranger is just a tool. What matters is what you build with it..!