Gear power level should be able to be increased

With how the current system is, I am afraid to invest in a certain piece of gear, because I know that it might quickly become obsolete once I go into higher levels. This affects unique items especially, because I don't want to dismantle them just to regain the enchantment points. 

To fix this, I think certain types of items, like unique items, should be able to be infused with an item of higher power. Of course, this can be imbalanced and make endgame boring, so to compensate, I think it should either cost a large amount of emerald, or make it so that only items with the same rarity can be infused with each other.