I'd like to suggest it be possible when enchanting comes out for non-barbarians to be able to destroy a rune which is out of charges. Basically like a DISMANTLE BOX for runestones. This is assuming that future runestones will not be rechargeable or recyclable for materials in some manager.
It also seems reasonable that this act could teach a smidge of enchanting, kind of like drying a herb does. (Just a tiny bit, stops teaching after about 50-70 ranks of enchanting almost entirely.)
This is mainly to help keep donation shelves and the like free of "dead runes". I often find 0 charge runestones on MU guild shelves, which is not really helpful for anyone.
Never attribute to malice that which is adequately explained by stupidity.