Until the arranger manufacturers start producing arrangers more like the MM6 (but more pro quality) that cater as much to younger players tastes AS WELL as our own, arranger sales will continue to slip, and stores will be less and less inclined to stock something the majority of buyers have no use for.
And the raping of the elderly (us!) has got to stop...! There is no reason other than marketing why a highly technical, extremely well built (few arrangers have the build quality of even a modest workstation) and voiced workstation costs thousands less than it's equivalent arranger. Simply on a bang for the buck basis, arrangers are a very poor bargain.
WE all know how practical these types of keyboards can be for older, classic styles of music, but as squeak, and many of the younger dance, hiphop and techno players will tell you, they lack many of the features and sounds that make workstations so popular. I don't think it is the workstations' workflow that is so popular, but just the soundset, editing capabilities and certain arpeggiator and loop capabilities. If these were added to arranger capabilities, and styles developed that sound like something from THIS century, a whole new generation would come to accept them, and we wouldn't have as much problem finding them in the stores.
But until this happens, arrangers' market share will continue to diminish, making them a poor choice for a cash-strapped music retailer...
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An arranger is just a tool. What matters is what you build with it..!