Kubiak's offense was consistent in Houston. His job status could come down to his willingness to take any coordinator job. We haven't heard much from Kubiak since he was fired in Houston, although he did interview for the Detroit Lions' head coaching job. Since Kubiak is still getting paid by the Texans, he essentially would be choosing to work for free if he got back on the sidelines in 2014.
Then again, coaching in the NFL is a way of life. Bill Parcells called it a drug, and Kubiak might not want to go a full year without a fix.