When the Pats won their super bowls, they didn't remain largely unchanged. They brought in new faces, fresh young talent, they released & traded players, and went about defending their title in a proactive manner instead of sitting on their laurels like we did. Our team has been largely unchanged for years now. Granted you're not going to get rid of players like Hines, Ben, Porter, Hampton, Faneca, Polamalu, etc., but looking at this team its amazing how much the front office and coaches just left well enough alone and didn't bother really trying to improve this team this past offseason.
Competition breeds excellence but there has been very little competition in our training camps for starting roster spots for years now. That much as got to change this offseason IMO.