Brown could certainly play in the G-League or professionally overseas right now and if he decides to leave the program at this point those would be his options. Keep in mind he is actually 4 years removed from high school, he sat one year at Arizona. When he transferred in last year I remember looking it up and 22 of the 24 guys on the McDonald's All America team with him were either already in the NBA or had a cup of coffee in the NBA and were now overseas. I think Brown and Quinerly at Alabama were the only 2 from that team still playing in college last year.
Also Akwuba, Williams, and Dalcourt are all in the same boat with a previous transfer and already playing 4 years. Under current rules if they wish to play next year in college next year it would have to be here unless a waiver was involved.