We've been made to expect payoffs all along.
No, we haven't. I truly believe that if you expected some sort of payoff or clear resolution, you weren't paying attention. Again, dozens of storylines and seemingly important characters have just floated away on the show--just like in real life. Sometimes what seems like an exceedingly important event in your life just comes and goes without any later relevance. And then there are just regular old days with nothing of bearing seeming to take place but then you find out that a snarky aside or an innocent grin puts events into motion you could have never anticipated.
But more to the point of that scene: Even when things go back to "nromal" for Tony, he's on edge. he has to be because of the life he leads. There is no simple, relaxing night at the diner with his family. Everyone who walks through that door is a potential threat. I think that scene was intended to increase the tension so you FEEL what Tony feels every day. I think Chase wanted the audience to feel that tension and then have to walk away with it, just like Tony does. To relax the tension in any way (through Tony dying, or being arrested, or whatever) would have ruined the effect. As a stroy device, I love it.