If they all go at each other then I think the Argonians or the Woodelves would win. The argonians because they already own two provinces so they've got s good starting position. And the woodelves because they would sneak around until the other races have butchered each other and then they would kill those who remain.
But in terms of the lore I think the elves are going to retake tamriel, the aldmeri dominion is back and the imperials and nords are fighting among themselves.