Though Steven Jackson's status for Week 17 against Carolina isn't known just yet, the fact his quadriceps injury almost immediately ruled him out for the second half of Week 16 at New Orleans is hardly reason for optimism. So then, Fantasy owners should be preparing for the possibility he misses the season's final week.
That is, if any who are still playing now are actually relying on him, which is unlikely. He's scored a touchdown in only one of his last four games and has run for more than 60 yards only twice all season. At this point, it's not even all that clear that the Falcons would miss him. His replacements, Jacquizz Rodgers and Devonta Freeman, were both more productive than him against the Saints, especially Freeman, who broke off a 31-yard touchdown run in the the third quarter and also had 48 receiving yards.
Of course, you'd like Freeman to be the first choice to replace Jackson, but considering Rodgers got more touches, that's far from certain. When Rodgers has gotten an increased workload in the past, he's done little with it, and he's averaging just 3.5 yards per carry again this year.
So if Jackson plays in Week 17, you probably wouldn't want to use him in Fantasy, and if he doesn't, an anticipated timeshare likely ruins whomever the Falcons choose to replace him. If you play in such a deep league that the replacement would matter regardless, Freeman is probably the best choice since he's more explosive, but it's not an exciting prospect.