Worst case - you miss approach and go around.
What do you think is the "worse case" for a light bulb in the cockpit being burned out?
A burned out light bulb once started a chain of events which ended in an L1011 crashing into the everglades killing 101 people.
Millions of light bulbs had burned out in airliner cockpits prior to that event without any crashes so it was nothing to worry about, right?