A Question about "Inception" (SPOILERS)?

I absolutely LOVED this ending, just for the record. The popular opinion seems to be that it was meant to be ambiguous, let the viewer decide what they want, which I agree with. Having said that, here's why I think it was real: Anytime he was in his dreams, you never saw the children's faces. At the end, you finally do, and it's the first time you do the entire movie, if I'm not mistaken. Other than that though, I couldn't come up with anything to justify it being real, and I'd need more than the top wobbling to prove it you know?? Either way, great great movie.