Well, if people want to make sure it stays alive, they're going to have to contribute towards it. The first. And main priority, is to decide how this mod is going to be experienced game-wise. Do you want it Lore friendly and faithful to the Elder Scrolls Universe? Or do you want more of the game focused on the players personal development on the campaign? There are many things to think about when starting a mod.
P.S.
After taking a look at the map, I reckon it could a great playing field tactics-wise: