I'm more worried about their SU-30's than their F-16 knock-offs. Wouldn't you concur?
Yes,but things seem to be coming to a situation where their J-10s are to their SU-30s what the USAF F-16 is to the Eagle.You need both.The J-10 would probably be built in considerable numbers & is almost certainly cheaper than the SU-27/30 while yet offering a level of commonality,which is a big asset.
Another headache is that once they develop their indegnious turbofan,they can hawk it to anyone from Pakistan to Iran to North Korea.Such sales are in line with China's wider ambitions.