In and of itself, Donovan leaving is not that big of a deal. However it is a big deal when added to Sam, Washington, Melo and possibly Key or Craw departing as well. At the current rate, we do not have enough players to play against each other 5 on 5. It also means we are going to have to throw the 3 frosh to the wolves right away (not counting Lewis until we know he actually exists still)
This is the problem. You build a program by having a few stars complimented by veteran leadership and roll players.
Players leaving within 2 years for anything but the NBA is bad.