I agree with what Elendilyon said. He only attacked Minas Tirith in hopes of destroying it. The attacks in the north were only to keep those people occupied (and avoiding any possible support from them to Rohan/Gondor), as well as the 3 assaults on Lorien.
As the appendixes say, the forces that were attacking Lorien would not be able to destroy the kingdom thanks to the valour of the elven ppl that lived there and, mostly, because of Galadriel's fences guarding the land. If Sauron wanted Lorien to fall, he would have to go there himself (my guess is to break Galadriel's fences and help his troops take over Caras Galadhon).
After Gondor, Rohan and Lorien fell, there would not be much opposition. Rivendell and the house of Tom Bombadil, along with the Gray Havens in Lindon, Mirkwood and Dale/Erebor, would not prove a big task (since their forces were a lot smaller).
But I have a question... Would Elrond, Galadriel & Celeborn stay here in M.E. and not flee towards Valinor once Minas Tirith fell? Would they have time to get to the Gray Havens to take the ship?
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"In place of a Dark Lord you will have a Queen! Not dark but beatiful and terrible as the Dawn! Treacherous as the sea! Stronger than the foundations of the Earth! All shall love me and despair!"
--- Galadriel when tempted by the One Ring.
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