Some people are missing the point. The WR coach is most likely going to be co offensive coordinator and will be in charge with installing the game plan. Richt already has a young coach in Thomas brown, he probably didn't want 2 inexperienced guys running the offense during practice. So regardless of how the receivers improved (which they did, I think beard will be a solid WR coach somewhere), richt couldn't take a chance on another young guy. That's just my take on it.
Then why did he hire his inexperienced son?