iMac was introduced in 1998, iPod in 2001, iPhone in 2007, MacBook Air in 2008, and iPad in 2010. All those product lines are still highly profitable. Even if Apple were not to come up with new product categories in the next two years, they would continue to grow.

However, Tim Cook hinted at the introduction of a new product category in the coming year. http://allthingsd.com/20130424/apple-has-amazing-stuff-comin...