WI: No Miracle of Brandenburg?

After the battle of Kunersdorf the Prussian Army was well and truly smashed, being little more than a mass of undisciplined troops. After the battle Frederick had only 3,000 men at his command (although more would join in the coming days). With his armies scattered and his morale in the toilet this left Frankfurt and Berlin open for conquest. However, nothing happened. The Austrians and Russians sat around and did not capitalize on the victory. So what if they did and The Russo-Austrians struck at the beating heart of Prussia, Berlin? Would they take it and smother the growing power in its cradle, or would it end in a debacle for the Russo/Austrians and allow for a continued Prussia?
 
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