I'm not trying to start another Sylvanas trial topic here, I think the other 20 out there are already enough, but if it came to the point where she goes batshit insane, betrays the Horde, turns into some mega evil raid boss and dies, what would you as a player do?
Imagine that the majority of the Forsaken still remain loyal to the Horde, now following Koltira or some other rotten dude.