I would like to see items available from guilds only if you meet a certain minimum crafting level; that or their supplies dramatically increased. Certain items, for example Wamoura Cocoons, are basically camped by non-crafters seeking to make a profit merely by reselling them on the AH after exhausting the guild's supply. It's rather demoralizing for people seeking to level crafts the slow and patient way when the guild supply of items is more expensive and/or unavailable due to activities such as this.
On the subject, too - it would be nice to expand the variety of materials available, given that a lot of traditional activities bringing in raw goods (mining, etc.) aren't practiced nearly as much now as they have been in the past. Thoughts?