It's a bit of a non-issue if you ask me. This remote-access feature sounds like what we usually call a software update feature if it came from a country we weren't scared of.

China disabling our buses? Really? That would be insanely petty and useless. I think maybe we're straining at gnats and swallowing camels, considering virtually all our phones, computers, TVs etc. come with auto update features, usually giving someone in the US the theoretical capability to brick it. And considering what was done to Karim Khan, I'd say they're far more likely to actually use it.