An issue of a KD I was in last age was that we kept trying to find a war for 3-4 weeks and nobody would bite. This lead to inactivity as people got bored pumping between trying to (unsuccessfully) goad other KDs into war.
I think it would be a nice feature for monarchs to have an option to opt the KD onto a "looking for war" matchup system based off of networth and KD size. It might make for some rather interesting random matchup (and occasional slaughterfest), but it would be KDs warring who want to war rather quickly.