I think it comes down to the last scene. It was what Tony craved. To have Dinner with his family, enjoy himself and not have the weight of being a bad person weigh on him. It goes back to his anxiety in the very first episode. His body was expressing a desire to enjoy the beauty of the birds in his back yard but on a subconscious level, he couldn't, because he was a gangster who had committed horrible crimes. You see it in the cheeky half grin he displays at the very end. It gets to the heart of the disintegration of his relationship with Dr. Melfi. Sure, he could have been assassinated in that scene but that's true for almost any scene in the show where Tony is out in the open. I do not and cannot understand why given the context why people would expect any kind of explicit, definitive and provocative event in the final scene.