>Sure, but people will just drive to the next closest airport and fly

Tell me you've never been to west Texas.

The next closest airport is Juarez, it's like 6 miles away, full fledged international airport. It's a few hours walk at worst.

They really prefer you have a passport now, and the vast majority of people do not. Also, I doubt this admin would mind if there was suddenly an uptick in one way travel into Mexico

>The next closest airport is Juarez, it's like 6 miles away

...In Mexico, sure. The closest major US airport to El Paso is Albuquerque or Tucson, 4 hours each.