Chances are very good. He's currently averaging a little over 9 points a game, and the Badgers have at least 6 games left. So he'll do it as long as he gets his average the rest of the way in—and indications are strong that his role in the offense is only increasing.
Dekker's scoring as a true freshman is all the more remarkable given that he is playing behind three seniors. Tucker, Wilkinson, and Harris all played their freshmen seasons on teams with basically no upperclassmen, much less upperclassmen at their position.
Obviously Dekker needs to improve his overall game, but his career is off to a great start and the future looks very, very bright.
For the record, here's the list of freshman who scored at least 100 points under Bo Ryan: