Of course Sid Meier wouldn't do a kickstarter campaign, Firaxis is a subsidiary of 2K Games so trying to would most likely start a huge shitstorm. Besides, if you're already getting the funding and creative freedom from your publisher that other developers are turning to kickstarter for it seems a bit... foolish. Let's be honest, most of the studios that have done kickstarter campaigns would give their left bollock (or ovary, to be fair) to be in the same position as Firaxis.