Speed up early advancement. It should be many times faster until you have a decent variety of skills.
Improve siege mechanics (eg, a new high end wall type that can only be attacked at specific times set by the village owner).
Give people the option of downloading Ender's client from the game download screen, as well as the normal client. recommend Ender's client.
Based on the slow rate of improvement and the small number of people playing this game seems doomed. I don't want to believe that it is, but it seems like the slow, occasional improvements to this game are not going to be enough to save it. There is something fundamentally wrong with it.
With the early advancement sped up and new players using Ender's client from the start, more of the people that try this game would stick around.
With a new wall type that forces people to attack when village owners are actually playing, we could have -actual fights- as opposed to cheap force summoning based fights.
Without these fixes to the early game and the endgame, I don't think it can survive. The odd little addition isn't going to save it.