So I suppose you think a string quartet playing Bach are stuck in the past?
The whole problem today is the "internet" has told young people you must do this and that to achieve musical greatness. When in reality nothings changed. Without learning your instrument properly and understanding how music works your basically going knowhere. So yes "back in the day" as long as you were a good musician, you could strap a guitar/keyboard on and go out and really entertain people. .. and I mean all people from all corners of society.
Ive got a couple set lists from the mid 80's and the stuff we were doing as a four piece proves my point. Pop chart stuff... bit of funky jazz, soul classics., and we doing hotels/clubs and the like and filling dance floors night after night.
At the end of the day the tight combo that can play anything using minimal equipment appears to be a lost art......Pity, but than as you said... like Bach. Maybe people like me are stuck in the past, and thats fine by me. Im just happy knowing a heck of a lot of people had a great time dancing to the grooves we were laying down.