What do you think happened on the sopranos last episode?

Yep, I and think that Tony was killed by the guy when he came out of the bathroom, a la The Godfather.

David Chase also cites the scene in the diner with Silvio when they were shot on equally a precise important scene. I can't remember that episode it was in, "Remember When", I believe. Anyway, the theme was "You presumptively don't even hear it when it happens", like Bobby make known in season 6B's opener.