Maybe the series finale of Lilyhammer will give Sopranos proper ending
If this is Silvio's dream while he's in a coma, when he wakes up, you can have Paulie, his girl and others in the Hospital room and he then asks, "Where's T"? Then they would tell him what happened.
Now, I think Tony was killed but for some reason there was a lot of confusion behind it. If and this is a big if, David Chase sanctions something like this, it would be huge for Netflix.
Favorite movie of all time - SCARFACE