I wasn't expecting a big "wrap up everything" finale from Chase. He's publicly stated that he had no intention of tying up everything in a nice, neat package, so I was not disappointed.

I think the final scene was a way of showing how Tony looks at the world. You're seeing things in the diner from his eyes. Everyone is under suspicion, they could be a potential hitman. Every time the door opens, he has to look to make sure they're not about to blow his head off. He lives in a life full of suspicion and paranoia, and will until his final breath.