That may be too late. A market bottom is more likely when the really famous guys are out of the market, because this is when their zillions of followers are out of the market and therefore cannot exert any more downward pressure on prices.
Another interesting tidbit is that some of the big guys who got really wrecked in the crash of '87 were the ones who, up until that moment, had the most stellar long-term records.
Since Buffett is still #2 on the Forbes 400 I doubt he got hurt at all. He started investing with $50,000 fifty years ago and has had the most spectacular run in investing history.
SO9