Just supposing that things could have gotten so far, Gandalf would have raced to Hobbiton after the fall of Lorien, and perhaps taken Bilbo with him to Minas Tirith; this because he was not yet sure of the Ring, but too suspicious to leave it and Bilbo unsafe in Hobbiton. Thus he would have had to avoid Imladris, which would have been too close to the advancing forces of Sauron from Dol Guldur, and would have found Caradhras no better than in the story that did happen. And then he would most certainly have avoided Moria, since there was no Lorien anymore to escape to afterward. This would have sent him right by the front door of Saruman in Orthanc, who would have welcomed them in for refuge; only to turn traitor and take the Ring from them. Or so it seems to me, taking this and that into account.
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