Even ignoring the fact that this would be horrible if it was implemented, there isn't ANY code in the game to support this. That means adding it would be an absolutely massive project, most likely requiring an overhaul of the core of the combat system. Its taken chadz years to add as much as he has, and that isn't even a fraction of the work it would take to add magic.
Oh, and you think people hate ranged now? Imagine the crying and bitching unblockable aoe damage would cause. The whole point of the combat system as it is, is so that if you die or take damage, it's your own damn fault. Start adding things like this and you end up with a system where you can die even if you played perfectly, defeating the core point of the system.
M&B is basically the only good medieval game where you play as a single character that doesn't include magic... let's keep it that way, if only for the sake of a little diversity in the genre.