How about this:
You make planets huge so they actually feel like planets,
You space out the quest zones appropriately
You greatly increase the movement speed of mounts
You make mounts feel like actual vehicles, not like you're running around normally with 110% movement speed
You add actual cities to the game, nothing too fancy but something a little better than a platform with some quest givers and vendors. I know it's the same thing, it just looks less terrible.
What would this accomplish?
Well, if planets were larger maybe it would feel more like being on an actual planet and less like being stuck in a heavily instanced ant hill nightmare, unable to move or free yourself from the cold firm grasp of millions of mobs because you're being kept in by unclimbable mountains and your speeder explodes every time a trash mob so much as looks at it.
If speeders went a bit faster and were a bit more durable maybe it would feel less like you're riding a push around buggy made of thin glass and more like you're riding, you know, an actual speeder.
If you had some cities maybe people would have places to gather (I wouldn't gather, but I want to see other people do it), maybe it would be worth going back to planets you've finished, it might even give you the illusion that you're in a real virtual world with other people and not all alone in a grindy buggy singleplayer game.
Admittedly world pvp is dead mainly because the pvp in this game is just awful, but a contributing factor I think is that you can't move around freely to look for people to kill because the world is actively trying to smother you with mobs and walls, and there are no obvious gathering places where you can go to find lots of people.