The modern Klingons are incompatible with a functional society, even madeup offscreen ones no one knows anything about. Besides, wouldn't it be more likely that anyone actually doing anything worthwhile in the Klingon Empire would be the occupied planets and the peoples enslaved on them? Except it is painfully obvious that the modern Klingons are too bloodthirsty and moronic even to exploit someone else's labor.
China is not rising to world dominance any more than the Japanese did in the Eighties. The increasing attacks by the government on the socialized elements of the Chinese state and economy will undermine the foundations that allowed the economy to keep growing for decades. As it becomes more capitalist, the economy becomes more unstable. As a late-comer to the modern world economy, China will not be able to carve out an economic empire but will fall prey to the inevitable vicissitudes of unstable capitalist development.
Worse, given the hostility of the US and the existence of a Chinese bourgeoisie seeking revanche against the workers of China and the inherent difficulty of the bureaucracy dividing a shrinking pie during economic depression, the Chinese state is going to collapse in a bloody civil war, which will kill millions. No doubt this will be a source of great satisfaction to Westerners.