Although nobody's ever gone broke taking a profit, hindsight doesn't always paint the prettiest picture on Wall Street.On Wall Street, there's always a next-big-thing innovation, technology, or trend vying for the attention of professional and everyday investors. Since the advent of the internet in the mid-1990s, investors have been eagerly awaiting the next game-changing innovation that would alter the growth arc for corporate America. After numerous buzzy trends have come and gone, artificial intelligence ...