How about a campaign system
I would like to see some sort of campaign system. Where maybe your instanced into a version of the over world with just your party. Maybe in a campaign you'll have to protect a traveling merchant from bandits or animal as he make his way from one town to the next and eventually have to head into a dungeon or bandit camp to fight their leader. Another example would be that you go to a town that's being attacked by the undead so you have to fight off multiple waves of enemies before making your way to a cave or fortress and then run through a dungeon where you have to fight a powerful necromancer at the end. Basically the idea would be to make you do various objectives in the over world before going in to a dungeon to finish it up. It would be a great way to tell stories in the world and potentially bring out more of its history and lore.