Has all the gloom-and-doom talk about the iPhone and iPad gotten you down? Are you worried Apple’s three-year-old tablet is a bit long in the tooth – especially against Samsung and other Android devices? Well, turn that frown upside down. The iPad isn’t going away. Indeed, one analyst says iPad sales are bigger than McDonald’s, Nike and many other Fortune 500 companies. In 2012, iPad sales reaped $32 billion, amounting to 60 percent of tablets sold. If the iPad was a company, it would be eleventh largest tech firm in the United States, says Bernstein’s Toni Sacconaghi.