IMO, they won't fire Nix. Instead, if he doesn't "retire" this off-season, I think he goes after the 2012 season. I know there are exceptions, but guys in their mid 70's aren't made to be GM's in the 24x7 365 day a year NFL.
Just another stop gap measure brought to you by the 3 Stooges...Wilson, Littman & Overdorf.