Wouldn't it be easier to keep Truman in Seahaven if he had grown up thinking that it was all there was to the world- that there was nothing outside?

It would have been easier that way except that, despite expectations, Truman does begin to notice flaws in the matrix. He begins to sense emotions and see things that are not in line with his artificial reality. Does Truman evolve past his artificial world? The story suggests that he does.