It's been said that if you're not growing, you're dying. Well, that seems true when it comes to careers, too. Unfortunately, in today's fast-paced, technology-driven world, sometimes it's hard to predict which jobs will be winners and which will be losers. But understanding the likely trajectory of your chosen field will be crucial to your professional success. "People need to ensure that they're in an industry, or working to enter one, that has long-term potential and security," says Debra Wheatman, a certified professional career coach and president of Careers Done Write. She says that if you're not careful, you could...