I don't think the Saints are in danger of relocation. In my opinion, the Saints have a brand now. A brand that wasn't there before 2006.
Anyway, they have a lease for another decade.
St. Louis Rams won a Super Bowl their and look at what happened to them. Its a lot of speculation right now, but I could definetly see them moving. I mean the Superdome isn't getting any younger. To be honest it's a great stadium but compared to these newer ones it's a dump. I think if the city and state don't play ball next time I could see them moving on.