By the way I read somewhere (I don't remember now maybe in Taliban book by Ahmed Rashid) that Central Asian oil and gas resources estimates were quite exaggerated in 1990s. So these stans are not real alternative to the Gulf in any big way.
New fields may get connected to the existing network, but that doesn't really answer the "connecting to China" bit of the pipe. In the long run, we're all dead. John Maynard Keynes