The Nerubian remnants really needs to kick up their game and become more ambitious and aggressive if they ever want to return to full power. They need to declare war on the new scourge, the Alliance, the Horde, and basically every other major faction on Northrend. They need to wipe these forces out and expand as much and wide as possible if they even hope to become powerful again. They need to conquer northrend completely and become a superpower again. And than finally they can set they're sights on the rest of Azeroth.