It will be so easy for china to implement blockchain based currencies. The amount of contact less and non fiat based exchange is amazing already.
Although it is not very secure, Wechat pay is used widely in major cities and is even picking up momentum in less populated areas.
The switch or even incorparation of crypto based currencies into the Wechat app would be an easy implementation for china. Wechat Pay can be used in almost any situation where both parties have a phone with Wechat accounts.
You can pay the taxi fair, buy a coke, pay for a meal or even gift friends on their birthday. The use of Wechat doesn't just stop at human to human interaction, many machines also allow for the Wechat pay method.
I see China to be a leader in the Crypto currency world.