I think I want to see Necropolis get started back up. It sounds like a very fun server and it sounds like it would have been successful had they not stopped working on it.
Whatever might be a great idea will never become a reality because there isn't a playerbase to populate anything complex. Nor a dev team dedicated enough to make it happen.
I could say, I want an in depth complex crafting system where you experiment with different spawned materials (ala swg) to have unique items and build status amongst crafters. Make it so you can train/tame/engineer animals and have them follow you around. It just won't happen without the proper official dev resources. current MMO's hit 50mil to develop, they don't have anywhere near that kind of funding.