Exactly when the camera showed that Cobb spins his totem but then he just left it to be with his kids -- I KNEW THE CAMERA WOULD LATER SLOWLY MOVE BACK TO THE TOTEM, since we can hear it spins before the totem was really back to the camera -- THAT is when I knew Chris would just end the movie without showing what happened at the end of the spin

Before she closed the final glass door, behind that door was nothing, just empty space of the road & the river.
When she breaks the glass door, what's behind it are alot of people walking to & fro
She made them all appeared out of nowhere

I'll spin this sucker tonight

Does Cobb’s totem keep spinning at the end or is it about to fall off the table?
A: The fact that the film cuts away before we know for certain suggests that they want us to keep guessing. But we think it kept spinning. Here’s our reasoning: Note that at the end of the film Cobb’s kids haven’t aged. They match exactly his memory of them. A memory which must almost surely by now be out of date, since he’s been away from them for many months. Though he finally sees their faces, otherwise they look exactly as he envisioned them. They're even wearing the same clothes. In reality, his kids would now be older and different than his memories of them. This could suggest that Cobb is still in the dream and the top does indeed keep spinning after the credits roll.

So means whatever we watch till end is just a dream