The Titans currently have 11 players that are scheduled to become free agents after the 2018 season. Taylor Lewan is one of those 11 who will be playing 2018 on the option year of his rookie contract. There is a 0% chance that the Titans let Lewan hit free agency, so we can pretty much just remove him from this list.
That leaves 10 guys with 4 of those guys being pretty pivotal players to the Titans success: Delanie Walker, Brian Orakpo, Rishard Matthews and Derrick Morgan. Is there a world where none of those 4 players are with the Titans in 2019?