This is something I've thought about quite a bit. I attended a concert a while ago where the violin soloist (playing a modern piece) wore a brightly covered paisley shirt, untucked, and trotted all around the stage. An elderly man in front of me kept complaining about his appearance with such banal comments as "It'd be nice if he dressed up" and "he looks like he stepped off a subway platform."
Anyways, I envision a group of musicians, all standing and facing the audience and playing with the exaggerated enthusiasm of a pop or rock band. All this in a venue free of all the current social stigmas.
Maybe we should bring "classical" music to bars, clubs, and stadiums?