Would a destroyed orbital body's orbit decay?

I recently finished reading the novel "Seveneves" by Neil Stevenson. The central premises of the novel is that an unknown object has caused the moon to break into several large pieces, with an immeasurable amount of smaller ones floating around. In the novel, the quantity of objects is sufficient to cause a Kessler Syndrome type 'white sky' event, which then somehow jumps to a bombardment of the Earth with many of the smaller pieces. Overall, my question is

A) Would breaking the moon into pieces cause a white-sky event, even in lunar orbit?

B) Would the pieces' orbits decay?

posted almost 8 years ago

Thorne Garvin‭

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