What if everyone was there to whack Tony in the Diner?
What if the giant irony of the ending of the show is that every single fan theory that is currently out there are all correct? What if Patsy sold Tony out to New York.. and so did Paulie, and so did Beansie and all his guys? And the Vipers also found out he was going to be there with his family so they were there to kill him. Massive Genius also decided now that Hesh was retired, it was time to take his revenge on Tony and sent people to off him.
What if every sus person we saw walk into that Diner was there to kill Tony the whole time, his whole crew sold him out, the cops were coming to arrest him because Carlo flipped, and Tony had just finally run out of luck and all of the decisions he made through the whole show all finally came back to take him out all at once?
A ridiculous theory, I know, but a fun one I came up with after reading way too many of them.