Looking at the playoff scenarios, it would take a miracle even now.
If the Colts win 1 game of their last 3, they guarantee they finish with a better record than the Jets. If they win 2 they clinch a playoff berth.
If the Steelers win 2 of 3 remaining, they guarantee finishing ahead of the Jets because of their win over them in Week 2. If one of those wins is against the Bengals, they clinch a playoff berth.
It would take a lot. The Colts and Bengals are still very much in the drivers seats for those playoff spots.