The pre-1999 EU put so much effort into rebuilding the Republic and the Jedi, only for the Vong to destroy it all. Furthermore, Caedus then destroys it all again, and then Abeloth and the lost tribe destroy it all again, and then Krayt destroys it all again.
The Old Republic and Jedi lasted 25,000 years, so why can't the New Republic and Jedi last 30 years?