You need to get out. Seriously - if things are that bad - bad to the point where you no longer care, you need to get out. Either that, your you really need to clamp down. You need to drag the faculty into a meeting room and basically rip them a new one about how their undermining of your authority within the rehearsal space, and their allowing of the diva attitude MUST stop, because all it succeeds in doing is creating second rate talent who will find themselves waiting tables, unless they get a pretty decent reality check.