With the changes in the works to rehaul dynamis to be more available and easier to access, I think it might be a wise decision to eliminate all but 1 type of currency.
This streamlines the Relic weapon quests and will hopefully make people QQ less about Relics vs Mythics.
I predict that the price of currency will fluctuate rapidly and finally settle at more or less what it is at right now with the 3 currency system.
I think changing to a 1 type of currency only system will help make currency available to everyone that needs it, and lower the gil value of Relic weapons.
Post here if you support this idea. If not, start an anti-change-dynamis-currency thread, and then a subsequent anti-anti-change-dynamis-currency thread.