There's that, plus....

***SPOILER***SPOILER***SPOILER***SPOILER***

Paulie approached Johnny Sack and hinted that he might wanna jump families and join New York at the end of season 3. But also, there were Christopher's and Silvio's arrest on book-making at the end of season 3 also. Maybe one of them is going to flip and end up like Big Pussy(?). All we can do is speculate. But if there's anything I've learned watching The Sopranos (and particularly season 3), it's that you should always expect the unexpected!