Henry
Autoexreginated
Felon said:...the wizard just casts defensively and maxes out Concentration and (if played from 1st-level) probably takes Combat Casting as his first feat.
Skill Focus(Concentration); the 1-point trade-off is well worth it.

Bottom-line: AoO's boil down to another thing for players to optimize...What AoO's do wind up curtailing is improvisation.
On the other hand, it presumes you want people bull-rushing, tripping, overrunning all over the place. Make those tactics TOO attractive without having to spend resources in them, and people will be doing them too often, and you're into wuxia territory again.
And, again, if you optimize your character to be good at something, then AoO's stop being a detterent.
Personally, I'm OK with Op-attacks being something you can optimize past, just like you can concentration checks, weapon and armor proficiencies, precise shot, and grappling maneuvers. I've been more in preference to some "system mastery" without going overboard with it for a while now.