I am not surprised that Hicks is gone. He is a very underrated player IMO but he is not anything different then what Texas already has in spades at the RB position.
You may see another player or two decommit soon. Texas doesn't have a lot of ships left. They are currently going after a QB (Tanner McEvoy) who Harsin apparently loves, and a couple of other longshots. If one of those decide to commit to Texas, there may be another decommit.