So the UK becomes the U.S. offshore quarantine/incubation area? Passengers from high-infection rate Schengen countries wishing to travel to the U.S. are effectively being re-directed into the UK for 14 days (or less if they're not honest to the U.S. authorities about point of origin), during which they may or may not be Coronavirus carriers.
If the latter, then no problem for the U.S. which just bans U.K. flight origin as well after our rate rises. Brilliant!