Originally Posted by
Scrysis
They kind of have already. Both the opening cinematic for Shadowlands has several of allusions to Arthas as Lich King, not Bolvar. Specifically, listen to Sylvanas' monologue as she climbs the steps. He's almost certainly going to be an important facet of the expansion.
Yup. Not only that, but both Sylvanas and Bolvar have strong narrative ties to Arthas specifically, which makes this doubly true.
There are a couple of things in Wrath that point to Arthas being open for a redemption arc -- the comments from Terenas about how rampaging scourge would have been worse than Arthas being Lich King if they were loose; the fact that A) Arthas had a bit of humanity in the form of his heart & B) how Tirion smashing it did terrible damage to him; his last words which, in the way they were said, have a strong interpretation that the true spirit of Arthas wasn't entirely in control and that it was a torment; and most telling of all, the mementos that Arthas held onto from his human life that you loot at the end of the Shadowmourne questline. These suggest the possibility of redemption (not saying that it will happen, just that there is evidence that it could) as the gestalt personality of the Lich King (as well as the madness that overtook him just prior) wasn't truly Arthas.
Sylvanas doesn't really have the excuse of being under a gestalt mind-meld with a second, malevolent personality. She's been free for a long time. And counter to what some would have you think, Sylvanas, in the World of Warcraft, has always been depicted as a wicked being. Even in Vanilla, she was directly responsible for the Royal Apothecary and the development of blight. And before we get to the ethics of war, the Forsaken have just as much access to swords and arrows, so all the blight does is form a weapon of mass destruction that screws over their "allies" as well as their enemies.
Then you have more recent events. In Legion, she was declared warchief at the beginning of the expac, but she goes on a wild goose chase for an artifact rather than acting as a warchief and guiding the entirety of the Horde. And she conspires with Helya, a direct enemy, which isn't logical if she has any interest in the welfare of anyone other than herself. She destroyed the Desolate Council (which, counter to arguments, hurts the Forsaken), and then in the key scene of Before the Storm, she shoots everyone who showed up, primarily because she'd be losing control over anyone who was even interested in reconciliation. The Forsaken NEVER mattered to her, other than a meat shield.
After 15 years of straight storytelling without even a glimmer of redeeming qualities, pulling off a believable redemption story arc with Sylvanas will be . . . difficult. Not only that, but Blizzard rightfully want to change the stale and stagnant formula they've been using all these years. That means that Horde will have to be a bit less bloodthirsty (and now they have the cast of characters to do it). Sylvanas and the old school Forsaken don't fit in the Horde any more, and it's time to make the Forsaken less of a two-dimensional race.
Being a central character and having a completed story arc are two different things. Arthas was ALWAYS going to come back if WoW existed long enough. When Warcraft III ended, he merged with Ner'zhul and became the Lich King -- controlling a massive northern continent and becoming a huge threat. So WoW had to confront that. Then, when he was defeated, he left his legacy behind -- the remaining scourge, and those he created, such as the deathknights and Sylvanas. He's actually key to Sylvanas, so you probably could have predicted that he'd come back in a major fashion some how back in Legion when they made her Warchief and put her in the spotlight. Going to go visit the afterlife doubles-down on this. You may not be happy about it, but we're going to see Arthas again.
I'm more afraid of a Sylvanas redemption arc, to be honest. A Sylvanas redemption arc, with her current personality, would feel forced. And if they were to do an Arthas redemption arc, it wouldn't (or at least shouldn't) involve Sylvanas. It should involve Uther instead. Personally, for Sylvanas, I'd go for a karmic justice route. We defeat the jailer, and Sylvanas is forced to take is place -- trapped in that horrific darkness she has so come to fear, and alone, as self-interests have demanded. Then she'd know what a true prison is like. .. for all eternity.