It's still possible though the road is unlikely. Here are the scenarios.
- Titans lose 4, Colts win out
- Titans lose out, Colts win 4
It takes two more Titans wins (or two Colts losses, or one of each) to seal the AFC South. Assuming a win against the Lions (not a big leap) the Titans will have to drop 3 for 4 (with one of the 3 being to the Texans) to not win the AFC South