Greetings lmp! Long time no see!
Arvedui never struck me as being a particularly strong character. The impression that I have of him is that he was rather weak. I personally doubt that he had what it takes to keep things together. However, if he had gone south, he might have engendered some children who were of sterner stuff.
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1. Were the Rohirrim in Rohan by this time? If so, what status would they have had? If not, would they have been welcome?
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They were not there yet, so who knows.
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2. How long would this new kingdom have lasted?
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Ummm, see next question.
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3. What would have happened to the Witch King?
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He would probably not overrun the northern kingdom because Arvedui would have brought help from the south. However, Angmar might have still been hanging around draining the Dunedain's resources.
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4. How would the Ring have affected this alternate course?
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Indeterminate.
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5. How would a united Gondor have affected Elves and Dwarves; and Hobbits?
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Probably not that much.