Elon Musk is supposed to be a visionary -- but he hasn't been acting like it lately (TSLA)

Mark Brake/Getty Images Since Tesla CEO Elon Musk arrived on the scene, he's been called a visionary. Recently, however, Musk has shown that he prefers short-term thinking. The upsurge in Musk's Twitter activity is the most alarming evidence that he's backing away from long-term thinking. "Musk is a long-term thinker in a short-term world, but his runway is running out." That's Dylan Byers at CNN, offering some insight into why Tesla and SpaceX CEO Elon Musk has seen Wall Street and the media sh...