China is one of the few civs (*cough carthage*) that heavily promotes an already extremely effective tactic. I don't think China's problem is it's mid-to-late game, which is what this nerf mostly targets. I think the true power of China is in how early they can start getting social policies. Having extra culture from turn 1 is an surprisingly potent bonus, and they are awarded even further when settling new cities at a point in the game where the extra culture from settling far outweighs the extra social policy cost associated with it. Ordinarily unless you rush monuments everywhere settling cities actually hurts you social policy wise, and even then there is still a good 10 turns where your city is doing absolutely nothing for you. Strictly speaking their kit has far too much synergy with itself. Settle more cities and get more food and culture, get more culture and get more social policies, get more social policies get more food, culture and a much needed science boost, get more science and get more of everything else. Not to mention that their science building also gives culture, when it totally shouldn't. In fact I'd go so far as to say that culture and science should never coexist together on the same source. Barring some early game culture rebalance or a reduction in power for social policies, the only thing to be done I think is either changes under which conditions this ability triggers, or preferably settling a new city does NOT give itself a culture bonus.