I think a lot of the confusion has to do with what people of the time would consider to be a star. I'm guessing if large amounts of asteroids or comets were to crash to earth, 1st century people would consider them stars.
Further, 'star' is just the English word chosed to represent the word originally used in the source language. Maybe it was the closest fit, but not precise. So, from this perspective it could happen. Really, it appears the only thing that couldn't happen is someone with an anti-biblical bias actually looking at a bible verse with an open mind rather than scepticism.
Granted, they would have no clue what asteroids were. My main assertion is that 'stars' could be the description Jesus used to get the point across. I think even though they wouldn't know asteroids, they would certainly consider them a fulfillment of what Jesus said if they were to come crashing to earth in large quantities.