You ignore the signal

The events in the galaxy go down as it was written in the grand books: You go to the Unknown Regions to fight the real Sith, Bastila remains with the Order, Mission and Zaalbar make their own company and make loads of money. The Jedi are almost hunted to extinction, but Darth Traya is defeated by a mysterious Force user. Then the Order gets rebuild from the ashes, and the real war comes, where you find yourself in the midst of action once again.

Despite that, you always had the notion that you should have listened to that signal. Who knows? Maybe if you had traveled to that planet, everything could have turned out differently. Plus, you would have had one last adventure with Bastila and Mission. Two people whom you loved dearly, yet never seen again following your departure.