I'm not sure if it's the right place for the topic, but...
There are many complains about public dungeons. It is really stupid that a few mobs shared by dozens of players, so that you end up running in an empty instance, trying to find at least something you could kill yourself.
Also the amount of players around ruins the immersion, there's no mysterious (and scary at times) feeling of exploring a dungeon that you had in TES games.
So here's an easy solution for it that might work:
When entering an instance give player a choice: solo mode or group. In solo mode the dungeon is the same as it is now but there are no players around. So you could kill normal mobs, which is still not really a challenge, but at least something. In group mode you enter a public dungeon, pretty much as how it looks right now, BUT all the mobs are elite and really require a group of at least 3 people to kill.
That way the challenge would be more proper and both solo-fans and MMO-fans might get what they like the most.