Christian Streiff needed a little bit of luck. He had nine months to gestate a plan that showed he could turn the Peugeot and Citroen twins into brands that will grow and thrive. It has not been long enough. He needed new product and helpful market conditions and he's had neither. The product's coming; but the market in Western Europe - by common consent - is now weakening. One positive out of two gives him just a fifty fifty chance of looking smart. Those who have been alongside him with sleeves rolled up will say that he deserved better.