I don't see the problem with zone defense. Really, it just seems asinine to tell a coach "the defense you are playing is 'illegal'." I hate artificial rules that are made to increase scoring.
I wouldn't mind seeing the three gone. Too much of the offense revolves around setting up the three... it's gotten to where you've got guys who are always looking to make the ESPN highlight play or taking threes, camping out at the line. The mid-range game is practically a lost art. Just get rid of it. (wouldn't hurt if players had more than one year of college ball, either... but the genie's out of the bottle)