Did you look in to the craft too much? or is this a "ZMOG it is not fair" post?
Do not get me worng, I am about as ANIT twink as it gets but I guess I am missing what the issue is. My guess is you think that twinks will end up with socketd equptment(And i am pretty sure Bliz says that "Most" socketed equptment will be droped in the outlands)the first actual gems, are made at skill level 300(no need to worry there). Realistly jewlcrafters will get some nice little bonuses, like the stone stautes that act like healing totems(eazaly distroyed), those are BOP so the twink will have to be a jewlcrafter to use/get them, the first item that you need to worry about is
Bronze Band of Force
Binds when equipped
Finger
Requires Level 18
Equip: +1 Weapon Damage.
Equip: Increases damage and healing done by magical spells and effects slightly.
Sells for 10 Silver 64 Copper to vendors
Item Level 23
Source: Recipe
A ring, that can be bought and sold with eazaly farmable mats, This is your fear? a Blue ring that is eazaly outdone by world drops? Honestly you have nothing to fear from jewlcrafting in the department of twinks(well no mroe than those twinks who take Engenering, will likely take Jewlcrafting as the second skill, so that they can make the healing statues. This is not some great shift in power just the porgression of the game.