Or drops out, or is asked to leave the school, or sustains a serious career ending injury. All of these things have happened to SU basketball players in the past 10 years.
Last I heard, Bryant isn't planning on making a decision until the spring. By that point, JB will have a much better idea what the scholarship situation is and whether there is room at the inn for another player. If Jones wants to go to SU, he might have to accept a conditional scholarship or wait until the spring to find out if there is room for him at Syracuse.