Here's a better question: Why have we not had a new flagship server for seven years? Three more years, and Kingdoms will be a decade old.
Think about that.
I know Graal3d is a neat pet project and all, but the rest of Graal's servers seem completely neglected at this point. I'd be thrilled up and down to see Stefan interested in another Gold server. Graal could be so much more innovative and interesting if a little attention was paid to its servers and its development tools half the time.