Is Apple slumping? The Cupertino, Calif., technology giant has been churning out impressive revenue and earnings as usual. But the company's product track record has some wondering if Apple has reached a plateau since the passing of iconic founder and former CEO Steve Jobs in 2011. Meanwhile, competitors Samsung and Google have caught up and, in some cases, surpassed Apple in the smartphone and tablet markets. Here are 10 signs that Apple has may have hit an innovation wall.