Agreed with Dida. One of the fundamental rules of programming and game design is don't give a game something just for the hell of it. Though, Masterofdragons and Warpstorm, you may love the idea of beutifully rendered graphics, and every battle zooming in to see the units fight each other in a combat sequence, the vast majority of the Civ community doesn't. Civ is a purely driven gameplay game...the graphics add an aesthetic touch, but there is no need for Civ to go 3D, despite what Warpstorm says, the vast majority of the TBS Empire-management games are not 3D, only illusion-3D, like Civ.
Obviously better graphics are a great thing, but a whole 3D engine is going to eat through processor power and majorly beef up the system requirements and lag game speed and for what? Civ games have no need of a 3D engine...the pirates picture may look nice and give you a thrill thinking of Civ like that, but for me personally, and most of the Civ community, we don't want Civ to look like that. I do disagree totally with the view that a game cannot have improved graphics AND improved gameplay, but I see no reason to give Civ a 3D engine when it is patently a 2D strategy game, when all its going to do is slow down gameplay and the actual running speed of the game itself. Better graphics is great, a more stylistic interface is great, but I really feel a 3D engine is a waste of time and energy when the vast majority of people have no wish to see cutscenes of bombers blowing up cities, or little battles every single time two units fight, or the ability to rotate round your warriors etc. Everything in the Civ3 map is representative, the whole graphics syetm is representative. A 3D engine will not be better for the game.