I hope Blizzard brings back Valor upgrades next expansion to replace Titanforging.
Seriously, the WoD and MoP systems were so much better than what we have now. Imagine if you could farm normal Mythics for Valor and use it to upgrade your 860 Arcanocrystal to 880 or something. The system would also alleviate the frustration players experience when vendoring BiS gear due to a low WF/TF.This would also cut down on the mandatory farming for prior tier pieces or old BiS trinkets (hello, Bloodthirsty Instinct), as well as provide an added incentive to run normal Mythics.