One of the things which makes me like Inscription so much as a profession is the fact that maximum level inks can be traded down, so you don't need to gather lower level herbs in order to make lower level glyphs.
I personally think that this idea should be expanded to the other professions; Cloth traders, Leather traders, Enchanting traders, etc. This would greatly reduce if not eliminate the hassle of farming low level materials for older recipes and enchantments. The corollary of that is that it also kills the market for older crafting materials. What are your thoughts?