It could rise. Buffett's and Munger's ages are well known and baked into BRK's price. In the event of a tumble, BRK could just announce a dividend. Or maybe a split.
Personally I think Buffett's stock selection method is a minor aspect of the stock's success. I own Buffett-type stocks (but stocks not owned by BRK) and I've beaten BRK in recent years with stocks like Boeing, Cintas, and MMM.
Big diff: BRK is leveraged and I'm not.
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