I've never heard of school for luthiery but it sounds cool. I have dealt with quite a few luthier's, good and bad. Not to sound all profiteerish, but your best bet to do well with it would be to get good at making your own guitars (or instruments). I'm not an advocate for "schooling", but if that's what it takes... just bear in mind that a lot of schools are set up to make money and don't always leave you prepared to recoop the investment. Not to discourage the school at all, just make sure it's reasonable and that they prepare you to make money - Sounds shallow, but that is what they are taking your money for, otherwise you can learn in the field.
Your best bet would be to work with an established luthier locally or something. Work as an intern or cheap labor until you 1. get the feel for the craft and 2. make sure it's what you'd want to do.
The best guy around me creates custom acoustics and does really well with them. He generally can't keep up with demand and makes a good living. This is him:
http://www.abitaguitar.com/ he's done some fret work for me before. Quite an asset for him to be available for repairs and all, but I don't think he could make a living off of it.... it's with his custom guitars.
My friend, who is a mutual long time friend of his tried to get in his shop to work with him as an intern or apprentice but the luthier doesn't take others in. He claims it's because he's so accustomed to making his own schedule and that he'd have to set schedule to have someone in with him and I can see that.... but I think it's mostly to preserve his craft and not let others cop his style basically.
That's just one guy, you might have some luthiers around you that would let you hang around their shop. I'd encourage that.