I agree that it will likely cost BOB his job, although that certainly doesn't mean that he is a lousy coach. That team right there basically sucks.
The decision to rotate two mediocre quarterbacks has proven to be a costly one. They obviously thought they could compete with a strong defense and running game. That isn't the case.
I would actually say that it's 100% the coaching that is what is wrong with this team. There is a lot this team is being made to do that it can't. This is an one-gapping 4-3 defense that is being forced to be a two-gapping 3-4.
The offense also isn't tailored to the talent that Houston has on hand. It is rigid; on many runs I saw a zone blocking that couldn't seal off the aggressive one-gapping that the Colts defense does, being historically known as an undersized but speedy defense. They didn't really take advantage of the overpursuit that naturally occurs with an aggressive defense.
But most importantly, watching BOB's body language last night- I never saw him offer encouragement, never saw him being positive or reassuring. Even a little "don't worry, we'll get them next time," would have gone a long way. His body language screams "You're never good enough for me. You're going to screw something up, I guarantee it." It's almost as if he wants something to yell and scream at.
Consequently, the players are not having fun out there, they're not playing loose and they're definitely not relaxed. They're playing scared and uptight, playing not to lose.
Also BOB's handling of the QB situation is downright terrible. You can do no worst than say one thing and do another, and going back on your word. So now he's lost the trust of both quarterbacks who are now playing with the knowledge they could get yanked at any moment, so they're playing to avoid making a mistake, instead of playing to win.