Time actually mattering is what I’d like to see in an MMO. Like, instead of a repeatable weekly raid that everyone gets to do multiple times, once a dragon / monster / supervillain is dead, if you weren’t part of the event killing it, you missed out. But, there will be more threats to the realm / universe.

Basically, I’d like to see the actions of players mattering the way it does in say Eve Online, but in a world with powerful NPCs and some story.