The Elder Scrolls VI. ГДЕ???

More likely, they'll side with the Empire; it's unlikely they'll make the negative characters canonical. However, they could come up with a scenario where, for example, the Dominion conquered Skyrim and carried out a massive massacre there.

And if the Dominion (let's call the 6th installment that) takes place in Hammerfell, it would be more logical to make the Stormcloaks the canonical side. Like, the Altmer went to subdue Ulfric through Hammerfell, and a massacre began there. Something like that.