Ro would be a huge gamble....just because he was a successful NBA player means nothing (example: Clyde at U of H) and while he has worked as a player development coach with the Mavs that is a far cry from game-time coaching.
Face it- we are probably going to have to take a chance on a young assistant from a major program. Sometimes you get lucky (Baylor: Drew), sometimes you don't (TCU: Dougherty)