Alphabet could become the largest company in the world in the next five years.Alphabet (GOOG 0.21%) (GOOGL 0.28%) has become one of the world's most important artificial intelligence (AI) companies. What investors initially saw as a big potential risk has instead turned into a big tailwind.And while Nvidia and Palantir Technologies get plenty of the hype these days, Alphabet has the opportunity to be worth more than both of them combined before the decade is out.Nvidia currently sits at a $4.3 trillion mark ...