LeBeau has always said things like this:

"We'll see how that goes. I don't think these guys had too bad of a year defensively," said LeBeau after the Steelers permitted the fewest points and second-fewest yards in 2010.
Well, we haven't had a good year defensively...at 76, he may step back and take an advisory role like he did in Buffalo...

I wouldn't be surprised if Mitchell retired as well....