"
But WHY? The stars of the show are the words and the story. It doesn't NEED huge names, and I daresay, it would likely detract from the very story it celebrates! When it becomes about the performer(s) you lose something special.
Also, most of the names you suggest likely wouldn't be willing to commit the amount of time, or to reasonable salaries that would be necessary.
And then, of course, can those people act? Dance? Once again, it's not just about singing.
Excellent post and you brought up great points.