There really isn't any point in controlling land unless that land is worth something. Who cares if CAV belongs to Omni?
There are only a couple of ways of encouraging Land Control/PvP:
1) Bonuses which only PvP participants can have. Like RvR points in Camelot, make it so that people who PvP can get stuff that people who don't PvP can't. Of course this will make all the non-PvP folks scream murder, but you can't have your cake and eat it too.
2) Make desirable areas controllable. Like... Broken Shores... Newland.. Hope... 20k.. Neutral areas that people go to.
I guess it would be way too much to ask for, but you could also...
3) Add worthwhile content to the unplayed PFs for which land control is possible.