they will be playable but can't RvR against npc, shroud will be a really populated place, probably the best one for PvP.
build a fleet with which raise hostility and try to cap a port will be easy with the medal earned.
build an OP in every freetown and start hostility from everywhere will also give unpredictability, a huge advantage.
so impossible nation will be playable at all but must be the harder so can't fight npc in PB, i think is easy and fair.