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Like I said earlier, I don't think Aragorn would have brought Narsil with him on his travels as it would have hindered him much more than helped him. Since I can't remember any mention of permanent dwelling-places of the Rangers, I've assumed that Narsil was kept in Rivendell because it was the closest thing Aragorn had to a home and therefore the natural place to keep your stuff. Yet, I can't see the Rangers living a fully nomadic existence either, with simple camps in wilderness as their only option. Perhaps they did have a home base somewhere in the old North Kingdom, to where they could withdraw or gather at need? If this was the case, the resoning of Ibrin makes perfect sense: Aragorn felt that the time had come for Narsil to be forged anew, and brought it with him to Rivendell for this explicit reason.