Yep... Niche markets. Unfortunately, that's not going to drive sales for the arranger market. It's a mass market world. I'm sorry, but Jewish kids in Brooklyn are not going to save the type. US/UK/EU kids are.

Ditch all the Granny styles, fill it with hiphop, rap, alternative, you have a chance of selling it to the vast majority of kids. Don't, and they get relegated to elderly players (50 60 and 70 year olds) and niche folk music players. That, like what happened to the 'home organ' market, won't be able to sustain the R&D necessary for new arrangers to keep progressing and improving. Just imagine what an affordable 'home organ' could do nowadays if they hadn't lost the market to synths and WS's...