It really is an amazing ending to an amazing film. It's also a little ambiguous, if you think about it. There is a promo for the show and several shots of viewers watching it, but you don't actually know whether Truman has really left his bubble to come into our world or if there's another even larger layer of the show on the other side of the exit door. That's how I see it anyway.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'
