Tesla is in a world of hurt. Sales in California, its main market in the U.S., plummeted 31% in January from a year ago. European numbers are even worse, dropping 43% in the year’s first two months. And in China, by far its most important market for profitability, Tesla sales crashed 29% through February. Its stock has tanked, dropping 34% this year. A backlash has grown against part-time CEO Elon Musk–who also leads five other companies–with protests at Tesla stores and the torching of