It's an understandable idea that has been suggested before, however... Since it's a feature that's really only used for leveling, it's not really high on the priority list.
Last season I got a pair of rivera dancers really early on my monk. A couple of town runs I manually put them back on until every yellow drop was an upgrade.
I gave up because I just started manually upgrading my weapons with red gems and it was much better dps increase.