Given that all phones are manufactured in China, I would say that ship has already sailed. But I am an equal opportunity guy - if NSA is spying on me it is only fair to let the Chinese in too :)
More seriously, since these phones are often bought from "gray market" vendors, I am more worried about cybercriminals planting malware in them when they are imported:
http://venturebeat.com/2015/03/07/security-firm-finds-pre-in...