I don’t think she’s going to die.
I think she’s doing what she’s doing now to avoid Death, working probably with some bigger bad and powerful entity from the cosmological Death domain.
She’s already died 3 times anyway. Once by Arthas. Once from Godfrey. And once from trying to commit suicide after Arthas was defeated and she had nothing left she needed or wanted to do.
But that time in the darkness of death after she tossed herself off Icecrown… that shook her. She wasn’t ready for that and after coming back has been actively trying to avoid it.
But… .we keep hearing the Sylvanas serves death. We keep hearing that the Horde under her is “serving death”. I think that may be more literal than some people expect. I think there is probably some larger Death cosmology domain entity she is serving now, something opposed to the Void, which is why the Void seems so manically frantic to destroy her (because she serves their “true enemy”).
And I suspect she has the blade that managed to trap the Old God Xal’atath now because she’s going to be integral to trapping N’zoth in the service of Death.
I don’t think she’s doing it to be a hero. I think she’s probably made deals to avoid a final death on her end, and that she now is indebted to some larger Death entity, but in it’s service she is fighting the Void.
I guess we’ll see. But I don’t think they’re going to repeat what happened with Garrosh so directly. And I suspect that at some point Saurfang maybe sacrifices himself to save her, even potentially this xpack after he sees she’s trying to lead the Horde against the Void and part of what she’s been doing has been to get them prepared for that bigger war.
I also don’t think she’ll stay Warchief. I think she’s just not compatible with too much of the Horde, but, I do think Blizzard has much bigger plans with her than we’ve seen yet, like her or not.