I have him in a keeper so I'm hoping for a monster year. If i had to project his stats now, I would guess something along the lines of Chris Ivory's 2015 with the Jets.
247 carries 1070 yards 4.3 ypc 7 tds. 30 receptions 217 yards 1td.
This is contingent upon the moves made with the oline, complementary rb and Mariota staying healthy. Obviously the new coaching staff will have to commit to him as well. I'm confident he'll get every opportunity in camp to win the job.
I'm hoping the Titans sign Charles Sims or someone in that tier or draft a back in the later rounds.