SAN DIEGO -- There’s been much talk this week about the possibility of the San Diego Chargers moving quarterback Philip Rivers to the Tennessee Titans for the No. 2 overall pick, which would allow the organization to select Oregon product Marcus Mariota in a reboot of the franchise.

Rivers is in the final year of his contract, has indicated an unwillingness to engage in contract-extension talks, and will play out the deal. Rivers also has heartburn over the possibility of playing in Los Angeles next season if the franchise relocates.

Moving Rivers via trade to the Titans offers a soft landing for everyone involved. The Titans get a franchise quarterback, Rivers can relocate closer to his family roots in Alabama, and the Chargers get their franchise quarterback of the future. Problem solved, right?

Well, here are three reasons why Rivers isn’t going anywhere and will remain in San Diego with the Chargers in 2015:

Philip Rivers, and not Marcus Mariota, gives the Chargers the best chance to win in 2015. Donald Miralle/Getty Images

Chargers are in win-now mode: The Chargers are a veteran team constructed around the durable Rivers to win now. The following players also enter 2015 in the final year of their respective deals: safety Eric Weddle, tight end Antonio Gates and defensive end Corey Liuget. So I would be surprised if general manager Tom Telesco and coach Mike McCoy would be willing to move their veteran quarterback for the chance to draft a talented but unknown prospect such as Mariota. Telesco said he wants Rivers to retire a Charger and would like to get a contract extension done sooner rather than later. McCoy said the expectation is that Rivers will play in San Diego in 2015. Telesco and McCoy also have one year left on their contracts after the 2015 season. In the bottom-line business of the NFL, going with a young quarterback does not lead to job security. Over the past two seasons, Rivers is second in the NFL in completion percentage (68 percent), fourth in touchdowns (63) and fifth in total QBR (69.3).

Mariota is an unknown commodity: Mariota had a lot of success in Oregon’s spread system. Draft analysts say he’s smart and could make a smooth transition to the pro game. Still, how the athletic Mariota will play at the NFL level as a pocket passer is more projection than certainty. He could be the next Andrew Luck, or he could be Jake Locker or Blaine Gabbert. While Mariota threw only 14 interceptions in 41 games as a starter for the Ducks, he also fumbled 27 times, losing 11. So ball security is a legitimate concern. However, Mariota was solid in pressure situations for the Ducks. According to ESPN Stats & Information, he was fourth among quarterbacks in the Power 5 conferences last season with an 85.6 total QBR on third down. He also ranked No. 33 in the red zone with a 72.5 total QBR in 2014.

Rivers is under Chargers’ control for three more seasons: Whether Rivers likes it or not, the Chargers can control where he plays in the NFL for two more seasons beyond 2015 by placing the franchise tag on the 33-year-old quarterback. That should provide enough motivation to get a lucrative, new deal completed. Rivers could choose to retire rather than stay with the organization, particularly if the Chargers relocate to Los Angeles. However, it would be surprising to see the ultracompetitive Rivers ride off into the sunset and coach high school football rather than play the game he loves -- particularly if he’s healthy, can play at a reasonably high level, and believes the Chargers have enough pieces in place to chase an elusive Super Bowl title.