This will probably be unpopular, but I think both players should die and be martyrs.
Realizing the dark side isn't the way to save the galaxy, Revan goes off into the unkown regions to face the true sith alone. He gets killed and that's when T3-M4 finds the exile. She attempts to finish Revan's mission and destroy the true sith one and for all (last remaing members of the sith species and their followers), but she too meets her end (Between the exile and Revan the wiped out all but one, the last member of the sith species)
That's actually a great idea. It makes much more sense for something like that to happen than them both surviving.
"There is something going on in time and space, and beyond time and space, which, whether we like it or not, spells duty." -Winston Churchill
"For of all sad words of tongue or pen, The saddest are these: 'It might have been!'" -John Whittier
"Apathy is death." -Kreia