A prequel would be great if it were to be made after Season 5, however i doubt it will, Most viewers would prolly stop watching when they realise there favorite actors and characters are gone (Not us hardcore Fans of course ) its life i guess

Chris: "He could be out there stalking us right now..." -Paulie: "With what...his cock!

Tony Soprano : You're looking good. Looking better.
Junior Soprano: Tony, if you're gonna lie to me, tell me there's a broad in the car waiting to tongue my balls.
Tony Soprano : Hey, you want that, it's a phone call away.