I think leaving the target of the attack up to chance would be a bit annoying, Jiro. Good idea otherwise though.
I would like to see more class-based characters though, similar to FFIX. Too often people who we consider to be a class, e.g. Kimarhi as a Dragoon/Blue Mage just comes down to their overdrives and their weapons, which doesn't really play a huge role a lot of the time.