The Nerevarine would return with a fleet of tsaesci and other akaviri who were fleeing conflict with the Ka Po'Tun and Tosh Raka.
He'd settle on the newly volcanic tropical isles of vvardenfall, uniting the various colonists and tribals in the area under his rule.
Vivec would crop up out of nowhere, claim he was still a god and take over Solstheim's government in a remnant tribunal temple uprising.
This Republic of Vivec would be in direct opposition of Nerevar's leadership- battles would be lost and some won, no one gaining ground.
Then.. out of nowhere an Oblivion Gate would appear! with it, Saint Jiub riding an army of cliffracers that ate both of the factions inhabitants.
Eating so much divine essence and spending a little too much time in Oblivion made the cliffracers evolve over time into sentient argonian like people.
So with this, Saint Jiub dies a peaceful death and ascends as a god among the Aedra. With the next year bringing promise for the clifdroths of vvardenfall.
For they squawked an agreement with the argonian rulership - they'd eat the remaining dunmer if Argonia gave them half of southern morrowind.
This they did and then got bored with Morrowind, so they all flew west in a great migration and decided to eat all of the thalmor off.
So did Tamriel come to peace at last by it's hated enemy - the cliffracers. But what happened to Vivec and Nerevarine you ask?
Well now.. the word is that they somehow ended up in Azura's realm of Oblivion, forever confining themselves to playing chess in a maze of thorns.
(What? you wanted speculation! well, that's my speculation for yer!
)