They are still making 'home organs'. Doesn't mean that essentially, the form isn't dead.
Be interesting to hear from a pro retailer that sells both arrangers and WS's, stage keyboards, pianos and synths, see what the numbers are. If you restrict the numbers to arrangers that sit in the same price range as decent MOTL WS's etc., and don't count the 'toy' ones, it's going to be a sobering figure, I would expect.
Walk into most music stores. Try to even FIND a good selection of different MOTL arrangers. Best of luck. Dress it up all you like, if arrangers are selling comparatively to WS's and stage keyboards, why the hell doesn't hardly anyone stock them? Racks and racks of Motif's, Fantom's, Krone's and Kronos's, Nords, Juno's, you name it.
Sorry, shim, but the facts don't bear out your impression. Sure, there ARE kids using them. There are kids playing home organs too. Doesn't mean that the majority are...
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An arranger is just a tool. What matters is what you build with it..!