Turning off weapons we're providing to others would be devastating for the domestic defense industry, right up there with the shot to our own foot that kicking Russia off the SWIFT system was. Trump may be okay with aggravating our allies, but killing faith in our defense industry is an unforced error I don't see him likely to make.

Now, if the UK were to turn against us militarily (yet again), it'd be a different story. But in lieu of that, the reputation of American industry is likely to be the incentive that keeps them functioning.