If you wanted to play pure crafter, you could always play a bard.  You would have access to some spells, and like the rogue, a bunch of skill points and class skills.  I would assume they would have access to pretty much every crafting skill available(due to the large number of class skills) and they wouldn't need to worry about training in another class's stuff(thereby sacrificing their capstone) since they have a large number of class skills.
Clearly, that is all conjecture since we don't know how the skill system will work and that is assuming GW keeps skills from the PnP version the same.