Odds of Getting In
Might as well tell you, nobody in the theatre wants to hear your ideas, because they're too busy telling you theirs. But if you do actually have what it takes (determination, a pretty blatant sense of narcissism, and the loudest voice in the room), there are a few opportunities.
Let's say the average play has seven actors in it. That means for every seven actors hired there is one director. But if you're determined, and determination counts for a lot in this business, there are professional directors out there making a living at it.
Of course, being a successful director also depends on how you measure it. (If at first you don't succeed, redefine success.) Thousands of high schools and community theatres hire directors. You may not get that fancy loft in Soho, but hey, it's work.