I personally think this is being driven by the "player's union" (with owners support) because the MLB players are upset about the high $$$ being paid to a kid that is not a proven commodity and could ultimately take $$$ from the existing MLB players. According to a MLP player (Braves), he sees this being passed by the union at their meeting next December. It will be interesting to see how it will affect $$$ in each round and how it will be received. The "hard slotting" could ultimately drive more high school kids to college, which, in my opinion, would not be a bad thing.
This could have a negative affect on the advisor/agent for high school players but could be a benefit for the college player. JMO