China isn't going to stop exports. But they are also working to bring wealth and economic growth to the masses of China. Building up the road and rail network to reach the interior, building up the infrastructure, getting a better education system and so on.
I'm not so silly to think that generosity is one of their main motivations for doing so. But stability is, and the ruling party realizes that long term stability requires an economy that isn't dependent on trade and a better distribution of wealth and opportunity.
Jay