The Tennessee Titans are chasing history and pleading for fans to witness it. They’ve got a coach who has won 17 games in his two full-time seasons on the job, more than triple the team’s win total from the previous two seasons, and there are questions about his future. The AFC South they were supposed to win has been lost. The offense that was supposed to carry them has been mediocre. The third-year quarterback who was supposed to reach stardom has had his worst season. But they’re in if they win. And if they do, it will mean a lot to this franchise. It should mean more to this city than it feels like it does right now. Maybe it will take a triumph over the Jacksonville Jaguars on Sunday at Nissan Stadium, and the Titans’ first playoff bid since 2008, to put a dent in that apathy. And here’s what a disillusioned Titans fan might say to all that: Don’t lose three games in a row to fall into this must-win situation. Don’t blow the division to the Jaguars in a year when your schedule and quarterback injuries within the division set you up to win it. Don’t take a massive step backward on offense and fail to meet preseason expectations and struggle to beat bad teams and expect us to stay excited. That fan would not be wrong about any of it. But that fan probably would have signed up in August for a win-and-in situation on the final day of the regular season. The ones who did show last week, to see the Titans lose 27-23 to the Los Angeles Rams to fall to 8-7, still managed to create a loud environment amid about 15,000 empty seats. That was Christmas Eve and this will be an especially cold New Year’s Eve, and those factors won’t help. This will be a telling day for the Titans, on and off the field.