Wonder if WeChat is next. That would be fairly effective in prevent overseas Chinese from communicating with the mainland and a lot of mom and pop businesses that operate through Wechat like the students who buy products for people back in China and advertise and transfer money using WeChat.
We'll be back to buying calling cards and dialing telephones, but I guess this is the era of decoupling one way or the other.
Maybe people will have to invent some kind of transformer software, like you plug a western chat app on one side and it passes messages through a third party relay to a chinese messaging app.