Been around the market for well over 40 years (Well over 45 years if you include passive involvement) and have seen many changes, here, in Europe and the US, I can assure you that Pro arranger players are negligible in comparison to home players. (Remember over 90% of arranger players (Or any type of player) don’t post on forums, so forums cannot be used as a guide)
Unlike most other manufactures that had a home and professional division, Korg was always professional, which is why their early arrangers got a reputation of being difficult to use, now things have settled down, they know how to make their arrangers do both in a form that most can understand, (Something manufactures with 2 divisions have problems with) hence they are going from strength to strength.
As to youth, then forget arrangers as they are for the old, (Uncool) and it requires something completely new to entice them. (If you don’t believe me just talk to today’s youngsters)
Bill