This sounds like quite a good Idea. But as Flob said, both student and teacher would have to be committed and involved in this. It all depends on whether or not the teacher or student would want to do this for a certain period of time. We wouldn't want people saying that they'll do the teaching, promising they'll keep teaching but then suddenly giving up because they're bored. Same with the students, what would we do to keep them happy and interested?
I love the idea about helping the new members who need it, but we hardly get /new new/ members joining FH because registration isn't always open. And it's very rare that it opens. Also (as WhiteLight explained) once people have joined, they just want to play the game and explore, instead of taking a browse through the forum. Finally, we have the help boards and tutorial boards to help them anyway when they need it.
Don't get me wrong, I'm not trying to turn this into a negative thing, but in some people's view it isn't really worth it. But it's a really appreciated idea, I'm glad you thought of it! c: