This question already has an answer here:
- At which dream level did Inception end? 10 answers
I know that a lot of discussion about this one has taken place already. But as you know its "INCEPTION"! every time you see it, it blows your mind...
So if you see closely you can see that in the last couple seconds of movie the totum trembles and the moment we think its going to fall down Nolan ended the scene. So here, was Nolan trying to suggest that everyone can decide there own version? Either you can think that the totum kept spinning and Cobb is stuck in limbo or the totum stopped spinning and Cobb is really back home.