Hextech Crafting Essences

In the Hextech Crafting system there are two essences: blue and orange. I think Riot should implement a trade/exchange system for the two different essences. For example X amount of orange essence will give you Y amount of blue essence and vice versa. This can be useful for people that have every champion and can only get blue essence which does nothing to get you skins, or for players who don't have enough of the specific essence they need.