This is again why Eve needs dynamic security status for every single system. Events, features, and things happening should have real effects on the status quo.
This is a very sexy idea, in my opinion.
Balancing it would be difficult, but I can imagine something where each system has a
baseline security status that it always "wants" to return to - i.e.: in the absence of other effects, it will gradually return to this status. Events and the like could change this baseline, but
players should be able to do the same thing (within reason). Pirates might decide to hit a 0.5 system pretty hard, and attack CONCORD and the navy there. They'd get standings hits, but if they keep up the pressure they should be able to drop the security status of that system to 0.4 or lower. To
keep it there they'd have to keep up the pressure - if they let up, reinforcements would arrive and local industry would work to replace the lost forces, all bringing the security status of the system back up. On the flip side, the white hat crowd should be able to actively do something to
raise the security status of a system. Of course, once they
stop doing whatever it is they're doing, the security status would start to drop back down...