I suppose that as long as they keep making money at it and people keep going to see them, they won't change a thing.
We recently went to see Don McClean of American Pie fame. He has aged gracefully and I honestly have to say that his show is even better than it was ten years ago. It may have been a little hokey but the whole audience were on their feet, (some crying) and singing American Pie in unison. It was a wonderful moment. There was no wild dancing around the stage by anyone but it was still an enjoyable evening.