Sauron doesn't need to send an army, nor Isengard. Physical safety is not the issue when the biggest danger is that of corruption from within. As we see later in RotK ("The Pyre of Denethor"):
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"'Work of the Enemy!' said Gandalf. 'Such deeds he loves: friend at war with friend, loyalty divided in the confusion of hearts.'"
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Now or later, that trait of Sauron, the Base Deceiver, remains. The Ring is in Rivendell, as the palantir is in Minas Tirith, a more potent device of the Enemy, potentially able to spark dissent and confusion even more surely than the palantir. To the unwary and prideful, the Ring is, I believe, always a clear and present danger, no matter the location. Galadriel's temptation and moment of crisis came, after all, in the very heart of her own realm. It was no protection from the lure of the Ring; it was her personal strength, gained from thousands of years of experience which provided that. When it came to allowing Merry and Pippin to be part of the Company, Gandalf himself admitted that he did not see the path ahead clearly, and yet felt moved to think it wiser to trust to their friendship rather than to wisdom. As we know, that presentiment turned out to be a good one, since even Pippin's foolish acts eventually led to some key events in the outcome of the war. But for his dropping of the stone in Moria, Gandalf might not have faced and defeated the Balrog, died, and returned in a more powerful form. But for Pippin stealing the palantir to have a look at it, Aragorn might not have reclaimed it at a point when his act made Sauron fear that he had the Ring, and thus pushed him to begin his war too soon. Gandalf's impatience with foolishness is his own character flaw, and one that I believe makes him more believable, more "human." If he never made mistakes, never had doubts, never said things he later regretted, he would be too perfect, and thus, I think, not as interesting.
Well, we're all entitled to our opinions and interpretations, of course, and on some things, I believe it is wiser to simply agree to disagree.