If Gandalf or any others would have taken the ring, they would have still been bent towards the will of Sauron. The only way to destroy Sauron was to destroy the ring, but they would have used the ring and become corrupted, and not have destroyed it. This is what Sauron wanted. There were none that could use the ring(I think) without becoming corrupted, Frodo nearly made it, but in the end could not help it. I think it might actually be harder, if you have great powers like Gandalf. It would be so tempting to have more, this is probably why Gandalf didn't take it in the first place.
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