Excerpt from Texans_Chick's blog linked above:
Let's take an opposing look at this rant, piece by piece. Say McNair wants to keep Kubiak, but hire a new GM and a new DC. The new GM will want total control. He'll have to fire Rick Smith's scouts and personnel people and pay them for two years. The new DC will want his own position coaches, but few are available. The new GM can't sign players for the new DC's system, and can't communicate with the players he's inherited until the lockout's over. In early September, the players miss a couple of game checks and cave in and sign a new CBA. The league says you have two weeks to get ready. Here come the Texans back to work. The new DC will have most of the same players, few coaches and no time to teach his scheme.
If the problem with this team is the defense only (which is bunk), how are the Texan any less screwed in 2011 by hiring a new DC rather than a new head coach? Sounds to me that 2011 is a lost year (in The World According to McClain) no matter which way McNair goes. So, why not do what's best for the team in 2012? That would be hiring Bill Cowher.