The media missed the real story about Warren Buffett's business empire this week. Speculation focused on who will take over as the head of his $136 billion Berkshire Hathaway conglomerate when Buffett, 75, goes. Buffett sparked the chatter by announcing that a successor had been chosen, although he withheld the name. But the interesting question isn't who is going to take over. It's what they're going to do with the company. The likeliest, but so far unspoken, answer? They'll probably break it up.