Mark Jackson has NBA coaching experience unlike Chris Mullin, from what I know Mullin didn't have any coaching experience. Mullin was pathetic as a coach and nothing more than a figurehead. So, Jackson might not be all that bad.
I hope McDermott doesn't leave, as kobebeanbryant stated in his post above, that would be bad for the Big East. Even though Creighton is 6-1 vs UConn, I think this rivalry is great for the conference-their games are close and competitive. If Creighton plummets to the basement due to McDermott leaving that would be terrible even if it means UConn going 100% against them.