Well, let's see... I remember the doom and gloom merchants predicting the death of music with the disco years and the rise of the disco DJ in the 70's...
I'm still here playing 6 days a week, they are gone (they aren't working 6 days a week, that's for sure!). Donny, it seems I didn't have to wait that long..!
I find it hard that anyone that has been playing professionally since the 60's cannot recognize how cyclical our industry is. Trends come and go, then come and go again. You get disco, then punk, then house, then grunge, rinse and repeat ad nauseam. And the whole purpose of it all is so YOUR generation (if you are a kid) can separate itself from the one before. God forbid you all drink the same Kool-Aid!
And to Mark, the OP... well, it's your choice. Quit music, don't quit music, who cares? Your enthusiasm or lack of it for music is YOUR decision, but to be frank, it sounds like you are looking for an excuse to do what you actually WANT to do. And I don't blame you... TBH, if you aren't getting much enjoyment from playing, it's an awful job! But blaming external sources for your malaise or ennui isn't really addressing the issue. There's PLENTY of good reasons to stay playing music, not the least of which should be, you LOVE music. Or you should. If you don't, you aren't trying.
There's PLENTY of modern music worth playing that is popular. There are five decades of popular music that people of all ages seem to enjoy, from the Beatles and the Stones, from Cream and Zeppelin, to John Mayer, Bruno Mars, Esperanza Spalding and the whole pantheon of young talented musicians (yes, just open your eyes, they are out there!).
But if you want to quit, go ahead. There will be dozen players with tougher skins and tougher mentalities, who apparently still love playing music lining up for what few gigs you do. Make their day!
Me, they can have my keyboards when they pry them from my cold dead hands!
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An arranger is just a tool. What matters is what you build with it..!