From: California, USA
If they implemented multi-player it would have to have periodic times pauses for everyone at once. Though, I prefer resources go to refining single player. As I have read, the vast majority of this type of game play sngle player most of the time.
Wish list:population centers beyond planetary(http://en.wikipedia.org/wiki/The_Culture):Ships,Ring Orbitals,Sphere Orbitals,Ringworlds,Sphereworlds;ability to create & destroy planets,population centers,stars;AI competently using all advances & features.