This is what I would do as owner, if given the reigns..say..right now.
I would keep everything the same as of right now. Wannstedt would stay in control. He's got a buffer of two games. He can lose two, but the third game, be it playoffs or regular season, he is fired. If he loses one game, and the second game is before the AFC Championship game, he's fired.
If Wannstedt is fired in the regular season. - Almost the entire coaching staff is fired and replaced temperarily by their underlings or assistants. I would take over as head coach.
I would hold a meeting with the starters and other key guys I would want to keep and tell them that they can take the rest of the season off. They dont have to play if they dont want to. If they want to continue to play because they enjoy it, or want to reach contract incentives, fine. I would make it clear that this was not some sort of trick to judge how much they wanted to play.
For the people who chose to sit, I'd replace them with backups. They are hungry, and they need experience. Let them get experience. As temp. head coach, I would try to make the remainer of the games entertaining to the fans by playing high risk football. Long bombs, blitzes, little used football schemes(Single wing, 46 D, etc), would see plenty of use.
I would put Rick Spielman in complete control of personnel decisions. I would interview a bunch of coaching canidates, and use input from Spielman to decide on my coach. I'd lean towards current coordinators with no Pro Head coaching experience. I'd also avoid coaches straight from College. The head coach would be allowed to fill his own vacancies as far as OC, DC, etc.
I would not be a Jerry Jones/Al Davis /Little Danny Synder type of owner, but I would become involved. I would not loom over the staff and players like a plastic-surgeried Grim Reaper, but I would be involved in day to day activities. I would expect to have input in the coaching staff, but the coaches and staff have the final say.
As for the stadium/media, I wouldnt change a whole lot. I'd fire whoever that bonehead is who runs the bigscreen, though.
I'd try to replace the music, voices, events, etc., with some that have a more harder edge. You wouldnt see as many events where TD runs around and acts like a moron, or little kids running all over the field. I hate little kids.
