[tek]

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How will his successor be able to take over when so much of Berkshire's DNA resides in Mr. Buffett's head?

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The answer is he or she won't be able to. Therefore the solution is for Buffet to spin off the insurance operation into a seperate company. Also spin off other whooly owned companies. Then start liquidating the stock holdings. Finally, issue a cash dividend to Berkshire shareholders and ride off into the sunset as the greatest investor.

Why set up the successor for failure? Cash out Buffet.