From the American Heritage Dictionary:
1. To bring back to life or consciousness; resuscitate.
For example, "The Doctors revived the comatose man."
So that means if you're reviving something, you have to consider that man, woman or musical . . . dead.
And bringing someone, something or some show back from the dead takes an awful lot. You can't just revive anything by using "The Secret" or because you liked the show when you saw it 20 years ago.
To have a successful revival on Broadway, you need the following:
major revisionist thinking, or a decidedly new take on the material.
2. A major star (and not one that we've all seen 20 times in other shows . . . give us someone new)
And if you really want a smash revival . . . give us both.