I work in the Theatre with various producers, I have nothing to do with this production but have heard it is in trouble. Its a matter of stunt casting or closure, putting many people out of work, if Joe doesn't manage to increase the revenue it will close early.
I do find this kind of casting distasteful but needs must, I don't think he would have been cast if Ashley hadn't first and he does seem to have rabid fans which may make him a bigger draw than she was. Unfortunately names in musical theatre that would draw a few weeks of good sales really wouldn't join this production.