I think crafting jewlery, furniture or such items that can't incorporate player art or some uniqueness that's visible with them will be a dead end in the game. If so and so's necklace, amulet, wristband looks like mine (despite different qualities) I'm less inclined to purchase it. I'm sure there might be an initial demand, but part of the joy of jewlery is its uniqueness. unless players can fashion them with designs and what not I don't see a long term demand. I could be wrong however, if there were functional uses added in game and off the top of my head (and this is way in the future) entrance to certain places based on what you're wearing etc... like an enforced formal wear rule or something. bleah, i've digressed.
I think the same holds for furniture too. If player1's bed looks like playerN's bed and so on, and it doesn't have functional capabilities yet (ie some use that makes the quality go down) then without some unique aesthetic quality with player designs created on the fly in game (impossible i know) i can't see it taking off. beside the demand will be limited as there are only so many guildhouses and no turnover of furniture at the moment. Though i'm not sure since i haven't been in one and can't notice the quality of furniture degrading over time. so correct me if i'm wrong.
so i'm more inclined to vote for the functional crafting magic weapons, alchemy (crafting??), and food making (which has lots of potential obviously and I know bugged breads that increase all of your health will be alot of fun).