This is only the case if you assume that everyone is fully decked out in the epic Jewelcrafting gems. Due to the drop-rate being quite low and the cost to buy them quite high, it is not really feasible that the average player will be able to acquire enough of these gems while the 4.3 content is still current to create an issue. We feel the benefits that Blacksmithing offers balance out very well when compared to the difficulty of obtaining epic gems, as such we do not currently have any changes planned in regards to this.