A common defense for the Star Wars sequels (episodes 7-9) is that the balance that Anakin Skywalker brought to the force would not last forever, which would explain why the First Order was able to rise to power and how Palpatine was able to clone himself and become even more powerful, as if he never died.
But doesn't this make the prophecy insignificant? I'm sure if the Jedi Order knew that this prophecy would only last for a few years they wouldn't fuss over it so much and look for this "Chosen One".
My question is, why was this prophecy such a big deal in the original trilogy and prequels if it had no everlasting meaning, as the sequels imply?