Umesh Ramakrishnan discusses the near-impossible task of replacing Nvidia (NVDA) CEO Jensen Huang, who was both a technologist and global evangelist for the AI revolution. With names like AMD Inc.'s (AMD) Lisa Su and Apple's (AAPL) Tim Cook being floated, Ramakrishnan says the market will stay nervous until the board shows a real succession plan, and that CFO Colette Kress must use the upcoming earnings call to reassure clients and employees that Nvidia's roadmap and demand remain intact.