I'm just used to games actually punishing people for quitting or running from a fight. Notum Wars are not really appropriate for a small population anyways, which really throws things off and is definately true in lower level PVP.
Easier to destroy, shorter open times, less frequent open times, limits on participant levels, defenders being able to warp to sites under attack (to accommodate being easier to destroy), and possibly instancing the fights themselves (there are ways to do this without taking away the tower sites themselves). Current NW mechanics encourage harassment and escape tactics as opposed to actually fighting the war.