Iala
A mix might include each guild being able to own an outpost (and only one), with there being a limited number of drills Atys wide over which those people interested in pvp can fight battles in an organised setting
Huh, I really like this idea, though I'd put a slightly different spin on it.
The outposts would be obtained according to the non-PvP model Kaetemi explains, and guilds could then attack eachother's outposts with the objective of stealing the drill. So the PvP would be the same as it is now, but if you win you don't take the outpost, just the drill, to put up at your own outpost. And one outpost could have several drills, ofcourse, if the owners are succesful at stealing more than one.