Don’t exaggerate the system’s capabilities
Recognizing you when yo try do board is not exactly rocket science. You already have a ticket and your biometrics are connected to this ticket. The automatic boarding system only has to match your image against the 200-400 expected passengers. This will have a very low rate of false positives.
It does not help against fake IDs at all. Why? It is a new ID to the system. It will connect your newly recorded image with this fake ID and make sure that only this fraudster/terrorist can travel with this ‘ID’.
Other agencies will search for duplicates. This should find people under witness protection who have been given a new identity, spies from foreign countries, and lots of people who just look like somebody else. With a population of almost 8 billion not everyone can have his unique face...