What exactly is the MD going to do for you.
What will the Masters in Aviation do for you, with out a bit of aviation experience behind it, especially, as you say, considering the current economics. I would consider spending the money elsewhere, but where, I do not know. You hit the ground hard enough, you might find a time building job that will help you towards your goal, whatever that goal might be. Perhaps save the money and use it later ,when you have a bit more experience, and can judge the aviation market more clearly.
Good Luck