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This does not concern me to much. Every other year there is some sort of huge lingering threat from another country. These threats are either real, or manufactured here at home for whatever purpose. Yes, China has some of the best code brains in the world. But the key word there is, "some". That means some are here in the U.S, some are in Russia, etc, etc.
The way I look at it is: America has nukes, and we never think about an American citizen stealing the nukes and using them against our own land. The minute another country has nukes, there is suddenly a massive lingering scare that last until our government gives the, "all clear" on the country possessing them. Even if the other country is an friend. I realize it's a different situation. But it's in the same sense.
My point being, any skilled hacker (and I mean the kind that are capable of these things) could take down pretty much any electronically driven item in the world at any given time. I have a close friend that if he wanted to, could program your Tv cable box to only play Jazz music, whilst wiping your computer clean, whilst repeatedly calling emergency lines from your personal cell phone, while ordering 100 pizzas on your credit card. And pretty much all it would take is a username from one website. Now imagine what a team of life-long dedicated hackers getting paid an enormous amount of money can do if persuaded.
Yes it is scary to think of, but I do not see it happening. At least not on the catastrophic scale the media is sure to build it up on.