I mean revoking SAP licenses alone would crash the US economy so we don't even have to wait until actual hardware that they depend on breaks.

Thing is Germany produces approximately everything there is under the sun and in a gazillion of areas we're the only producers. Think a hospital's logistics collapsing because they can't get replacement parts for their pneumatic tube system, any more. The stuff you never think of, that's what's suddenly going to be missing, everywhere. Or when did you last think about how to get blood samples from bed to lab, drugs from pharmacy to bed, in a large hospital? Certainly not by email.

But realistically speaking the US would probably willingly pay damages and reparations. Materially or in some diplomatic quid pro quo manner and all of that is going to happen behind closed doors and we'll know once records get unsealed.