Perhaps the return of Frodo & co. from... wherever it was that they were... motivated the hobbits to take back what was theirs?Frodo & co.'s superior martial skill/knowledge of tactics etc./previous history & experience with the removal-of-wizards-(specifically Saruman)-from-office helped as well. It's quite likely that if the hobbits had tried to overthrow Saruman without the skill & knowledge of Frodo & the gang, they would have failed quite miserably. In addition, they were probably afraid to.
And Sparrow's probably right; it's quite unlikely that a hobbit-bow could fell Saruman, him being a spirit of the Maiar and all. They shot Grima, yes, but Grima was a mortal man.
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"Candy: tastes like chicken, if chicken was a candy."
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