PvP should be a tool for Powerplay to make it even more enjoyable and we all know what is the only way to "force" the PvP factor. (But I am afraid to even talk about it).
Oh and by PvP I don't mean duels or aiming for the kill: PvP is even just disrupting other players' actions, making them slower or far less effective. PvP kills should not count. And as for the usual stuff like: different time regions etc well... what we should aim is that PEOPLE can match and play together or against each other, not some people in particular.
We should aim for more: more players, more fun, more variability. But the only way to make the game successfull is that players need to see other players in game, that is the only real perception by a customer for a successful and alive game.