For all the people freaking out, they're going to treat it similar to how they did with the Grand Companies. You'll have your specialist crafting class to get the new recipes and skills, and then once a certain point is achieved, you'll be able to change which crafting class you're specialized in at a certain capped interval. So it'll be okay.
No, it'll be pointless. No one's gonna switch and eat a cooldown for a single recipie, they're gonna level an alt.