Did Walmart crumble when Sam Walton died? Did McDonald crumble when Ray Kroc died? How about Apple and Steve Jobs? The answer to all is no, and Berkshire will be no different. If the stock price does sell off when Buffett leaves or dies, it will be a great temporary buying opportunity, and I think Buffett himself would agree on that. Heck, I wouldn't be suprised if he leaves instructions to conduct a massive share buyback if it pulls back far enough upon his death. Buy this stock on any and all weakness, as I have been doing since justy before the BNSF split.