I've always wondered about this. Beijing is not really at the centre of the Chinese civilization. It's right at the secluded edge, near the deserts, where the winds blow sand all over it from time to time. It's been used as capital by barbaric invaders like Mongols (Yuan) and Manchus (Qing) and that idiot Yan Xishan. Its abbreviation is BJ.
I think Xian should be the capital. It was the capital of the Zhou dynasty, Eastern Han dynasty, and who could forget, the mighty Tang dynasty.
Screw Beijing. May the great deserts eat it up, which one day it will as it slowly grows bigger and bigger.