The architect had to show him the new door. That was the fatal flaw in the program: Choice. Neo had to be able to choose. If he hadn't been able to choose then there would have been no flaw in the program at all.
I just saw the film and I was very impressed by it. My biggest concern going in was that the film would not be able to keep up with the origanal's philosophical and nearly religious edge. However, my hopes were unwarrented. The film maintaned the psycological, philosophical, and nearly religious twist that the first Matrix contained while at the same time delivering killer effects. Great film.