This isn't a hypothetical; you can already buy stuff from tons of Chinese companies online -- good luck getting any recourse in a Chinese court if you have a dispute.

I could imagine maybe a law requiring foreign companies to obtain a bond when selling consumer goods, if they don't have substantial presence in the U.S. This bond would be a surety that consumers could recover damages in the case of negligence, at least up to a certain amount. I don't see the argument for requiring Amazon to perform that service, though.