Chargers game: a must win?

Is next week's game against San Diego a must win?

I say yes and here's why...

-The Titans remaining schedule is much tougher than either the Browns or the Jags.
- Week 17 against Indy doesn't need to be a "must-win" game
-Obviously the Titans need to win out for the best possible chance at making the playoffs.
-If we lose to the Chargers, then all of our remaining games pretty much become must-wins