The Warrior of Light is going to die in 4.0, because the fact that everyone's starting to overly rely on the Warrior of Light has been hinted on time and time again. What is the world going to do without its champion?
Of course, the death wouldn't be permanent, because, hey, Warrior of Light. But think of all that could happen in the WoL's absence. Like, say, another Calamity, this time in the East.