For every person farming honor to with the sole intent of selling gems, there are probably 100 others farming heroics to convert emblems to sell gems. When 3.3 hit and LFD was introduced, there was definitely a pricing impact across the board on my servers gem market (20-30%) which still persists to this day. I expect the pricing impact of the BG changes to be pale in comparison to the aftermath of 3.3 tbh

source: xmuting/selling 20-30 cuts a day sense October