Yes/no. That may be the only stuff left on the formal retail market in the US.
But I don't think that "devices" should be the biggest worry. China (and even Europe) aren't going to stop making devices. Moreover, there's nothing in theMarlboro Protection Act, er, Tobacco Control Act, that authorizes or allows the FDA to ban imports for personal use; they can only block imports intended for sale or distribution. So if a person wants an rba or mod, they should still be able to order it from overseas.
The real worry should be consumables. I suppose there will be at least a few large liquid companies who will file PMTAs. The question is: Will the FDA approve any of them? If they don't intend to approve any open systems, why would they approve any liquids? Now in principle, individuals could order liquids from China as well (Europe is more or less out due to the 10ml / 20mg/ml restrictions already in place due to the TPD), but does anyone really want to vape Chinese liquids? Personally, I'd have to be pretty desperate.
I was fond of Hangsen for a while as were plenty others, but I get your point. Seems to me JUUL have not done the vaping community any favours with the crazy high nic content in the US.