How about making a start by abolishing the need to pass immigration on transit in those airports that took the effort and provide a dedicated international facility. To avoid confusion I guess a visa would still be required for passengers from non VW-countries, but it would save a lot of hassle on transit anyway.
There are nicer ways to spend one's transit between 2 long flights than standing in line for immigration into a country you don't even intend to enter

Almost every other country I've been to requires outgoing passengers to pass immigration both on entry en on exit, giving them a much better degree of control on overstays ; in the case of the US it's all to common for visitors departures not to be registered ; you don't even get a stamp in your passport to prove you've left.

I've spent extra money for direct flights Europe to Latin America so as to avoid US transits because of this issue (made worse be the fingerprinting requirement). I'm sure I'm not the only one.
I notice Air Canada is introducing direct flights Vancouver to Sydney, Air New Zealand's main route to Europe now transits at Hong-Kong instead of LAX, most passengers for Tahiti will now transit through Japan,...
A few years ago I talked to French passengers on a plane from Easter Island to Tahiti. For them one of the advantages of this roundabout route was that they could avoid US immigration (even though this route requires passing Chilean immigration at SCL, and exiting at IPC).

I think these issue will end up losing the US tourism industry and US airlines a lot of money and goodwill until it is corrected.