Tesla CEO Elon Musk, his Cybertruck, and some shattered windows.Frederic J. Brown/Getty Images Bloomberg reported this week that Tesla would scale back production at its Shanghai factory. Tesla is being outsold in both the Chinese and the European markets as competitors press in. While Tesla has 67% market share in the US, S&P Global predicts it will hit 20% by 2025. What's Elon Musk to do when electric-vehicle makers start vying for Tesla's top spot in the US?