Or at least have them show up much more regularly when the option for more world events is selected.  I recently completed a really fun game on a large map at the penultimate difficulty level.  The game lasted for hundreds of turns due to how long it took to beat the AI down (AI performance seems significantly improved in most areas outside of diplomacy), but I only saw a single major world event, the Spider Queen, and only when the game had about 20 turns left in it.  I could have easily won the match well before any world events appeared, had I pursued a victory condition besides conquest.  Given that most of the major events add a lot of fun, and that they provide many of the games most challenging fights and best loot, I'd really like to see more of them, and much earlier.