Very pertinent indeed. But let us also appreciate that progress in technology never comes to an end; rather it goes on proceeding towards perfection.
The professional Face Recognition (FR)too, if not already doing so, shall include Biometrics and compare not only facial features but also iris patterns of both eyes.
From this point of view most probably a person will be required to show his/ her face without glasses to the FR System so that eyes biometrics too are included.