You'll note what happened to the offensive coordinator that called those games. Also note the difference in Flacco's performance after that change.
I'll also add that it's pretty tough to jetison a QB that has led your team to at least one playoff win every year he has been in the league. This is doubly true when he just won the Superbowl and was the MVP. I cannot think of any similar situation where the QB was ditched. Anyone else?
1 Kings 11:3: “He (Solomon) had seven hundred wives of royal birth and three hundred concubines, and his wives led him astray.” -- Biblical marriage. One man, seven hundred women.