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Even if Sauron somehow conquered the northwest of middle earth he still wouldnt control the whole of Arda: he still has to invade the new continents that arose after the downfall of numenor (the Americas I presume), Afrika and the Far East. But even if he achieved total domination, I don't think the Valar would intervene. Somehow, somewhere (maybe after a little "divine Inspiration") there would be an uprising against his rule ...
But IF the Valar decided to attack him I don't think that war would be as catastrophic and world-changing as the earlier wars between the Valar and Melkor (the primeval conflicts, the battle of powers after the awakening of the elves and finally the war of wrath). These conflicts were so destructive because of the power involved and the power that was needed to dislodge Melkor. If the Valar invaded a Sauron-dominated Middle-earth the ensuing conflict would be far less supernatural and more like a conventional human war: an army of maybe 50 000 Vanyar and Noldor led by a dozen Maia officers would suffice and the ensuing destruction would be local (some destroyed towns and a burned forest or two).
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