The Liberian .gov isn’t going to shut down the airport, and even if they did, people will make like the Vietmanese and sift through their border to another airport destination.
All those connecting flights through Europe and Asia…not gunna happen.
Your TSA/Customs need to perform a real function by not letting anyone into the country (or on the plane to begin with) with a passport stamp from the Hot Zone.
Of course that ain’t gunna help Jim Bob from Texas sitting on a plane next to a carrier.