We'd really experience a paradigm shift if someone could find a singing horse.

I'd like to hear some opinions on this. If a folksong is 400 years old, obviously there are going to be many versions and the most common version today is probably not going to be the original. Let's say the most common version is only 200 years old. That's good enough for us to call traditional but what about 200 years ago? Were there people then complaining that no one does the old songs right anymore? How about 200 years from now, will the Fairport Convention version be traditional?