One dimension of my current character concept is to be Master of Weapons, but my character does not believe you have truly mastered something until you can teach it. I currently have 8 profs, weapon master, style master, thrown weapon, archery, and waylay, therefore I am able to potentially teach any weapon skill or style. I have also learned all the fighter skills in-game, so it's only a matter of time/build to purchase them at this point. Once I have one of each of those skills, I then plan to take teacher for each skill from Critical Attack to Eviscerate and be a true Master of Weapons, possibly starting an in-game dojo or similar training camp for in-game practice and skill training with boffer weapons.
Similarly, the end game for your character could be a Master of the Magical Arts, able to teach both schools from 1st level to formal in a single day. I don't see any problem with that from a game design perspective and lots of opportunity from a role-playing perspective. Anything that encourages player interaction in a positive role-play scenario can only be a good thing for the game.