When thinking on what will happen next with Sylvanas, I had an idea. What if, similar to the Horde choices in BFA, they actually utilized the covenant system for something important:
Ladies and gentlemen, The Arbiter is gone, and a new soul is here requiring judgement and assignment.
Where do you send Sylvanas Windrunner?
Ardenweald:
Perhaps not the best choice given recent tree-related incidents, but you see potential in her to make up for them by guarding the wilds!
Maldraxxus:
Sylvanas Windrunner has always been a strong opponent and a powerful necromancer, there's no doubt an ex-banshee queen could find a place for her strength here.
Bastion:
Oh my goodness, could you imagine someone like Sylvanas with angel wings? But if you're looking for a place to literally start anew and cut all ties with your past, there's no better covenant.
Revendreth:
Perhaps you think, whole in soul, that Sylvanas deserves a chance for redemption, but there's no sense making it that easy? Come on down to Revendreth Rehabilitation Services, where we have a large selection of torture methods to literally beat the evil out of you.
The Maw:
For those with no shot at redemption, there's always The Maw. If it's good enough for Arthas, it's good enough for her, right? And hey, you can always use the extra Soul Ash for a backup legendary!
Other:
I'm eager to see any other ideas people can come up with.