With 1.3 billion potential users wouldn't that be enough?
That is a big possibility that a government like China will introduce a bitcoin of theyre own and be supported by the people on that country that is a given reality. Is it good to bitcoin? Yes, then it will be the end of China interfering on bitcoin investments. That is better and I dont see any bad consequences to it on bitcoin price.
Would they need BTC?
Most likely, 10 % will still or assuming will invest or transact with bitcoin. They cant control 1.3 billion people(if this is correct) that has different mindset and with the technology usage that can either hide ones personal identity, the position of the government will always be on those who follow them and punish those werent.