Of course, that doesn't seem the real reason - the original trilogy, the evil and corruption lost and a new republic and new jedi order would be formed, the idea that the Republic and the Order itself were fundamentally corrupt and needed to die anyway just doesn't seem to be there in the material.
My guess is that this is a fundamental problem I had with both prequels and sequels. That an evil force could overthrow the forces of good and lead to major setbacks I can accept, but that they fundamentally don't work and are deserving or even doomed to fail is a view I just don't like.