Interesting question. I would say that Hitler would not sacrifice his experienced and successful generals such as Rommel, Manstein, Rundstedt and so on. He did pull Rommel out of Afrika. As for Guderian, I would say the Hitler may have let him go.

As for responses, Rommel probably would have pulled out as would Heinrici, Guderian or Manteuffel. Shroeder, Model, Rundstedt would have stayed. Hard to say though. The collapse of the Hungarian, Italian and Rumanian fronts caused the counteroffesive to be so quick that there may not have been a chance to perform an orderly withdrawal and may have resulted in a melee towards Rostov

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American by birth, TEXAN by the grace of GOD!