Very end of Inception: Dreaming or awake?

Me and my friends have been debating this subject for a while. Im talking about the very end where they guy meets his kids again and you see the top on the table. I believe that he was dreaming because the top wobbled, but never fell. If you refer to earlier in the movie it also wobbled while it was on the Chinese guy's table. Please give me any input you might have, thanks!