If they just wipe Revan and the Exile off the storyline, then it's going to suck balls. After all they've been through, all the battles they fought, the influence they had in their time, it would be incredibly lame to just have them suddenly disappear without a trace and never be heard from again.
One thing that fools will never understand is that only a weakling lets the darkness control him. A mix of light and darkness is a powerful thing. Volatile, yes, but also unexpected, and thus even more dangerous.