These days, nothing is certain about the tech market or the world at large. Even Nvidia's seemingly bulletproof stock took a hammering on Monday, enduring

No matter how great a company is, even the most successful product eventually matures and declines with the passage of time as rivals angle for a piece of the market your innovation created. A case in point is Apple’s iPhone,

In China, Apple’s second largest market, iPhone sales fell 18% in the December ending quarter, according to Bloomberg.