I guess it depends a lot on your take about the location of the next expansion.

Given that some prominent theories are time travel and/or visiting another shard... Then it would mean that Varis and Shadowhunter would both be somewhere (Somewhen?) on the Source while we're off doing Shadowbringers stuff.

Though, it is slightly odd that Garlemald was given such a short overlook, after seemingly hyping up the fact that we'd have to go there (Though, I suppose now that Alphinaud has returned, that seems less likely)

So yeah... At a guess, after we beat up Zenos again and likely shut down the encroaching army (Since, I don't think morale would be too high after we beat Zenos a second time...) we go off to do ShB content. With Varis having a hissy fit that even an Ascian in his son's body failed to beat the WoL and that his army isn't able to take back Gyr Abania while Shadowhunter goes back to hunting Ascians while we're gone.

Possibly some arc occurs where Varis starts to see the Ascians failing as a sign that maybe his grand plan of "The One True Race" is kind of silly (But then again, illusions of grandeur are a thing when the Emperor's get literally worshipped...)