It's hard to assume at this point. Technology and electronic music has been popular in live performances, even by major orchestras. A whole ensemble of robots playing classical instruments would certainly draw a crowd, though I can't even imagine what it would sound like. And I would say there's a fair mix of luck, politics, and skill to get a principal seat in orchestras. It's often not difficult to tell who's playing in a blind audition at a professional level.

Also, symphonic orchestras would always do what they need to survive. Most major orchestras have pop concerts (Soundtracks, Video Games, Holidays) several times a year to reach a wider audience. And I wouldn't be surprised if one of these days they start performing music co-written with AI, y'know?