I think Fred will someday go to the NBA, but I don't think he would do it yet. Don't forget....he witnessed first hand what happened to Floyd in Chicago, although granted Floyd had nothing like Fred's NBA experience, but then Fred does not have Floyd's head coaching experience yet either.
I think Fred will really want to build this ISU program and have some real success with it, plus leave it in really good shape before he leaves for the NBA. Even more success at ISU is not going to hurt his NBA chances.