Will the tech giants of today be irrelevant in the future?

And last week's selloff aside, the world's biggest tech companies, of course, often called the Magnificent 7, are the locomotive that's been powering the markets. And to some people, they're here to stay. But our next guest is not so fast.Market history tells us that big dogs rarely stay on top. Joining me at the desk, Rob Arnot, research affiliates, founder and chairman of the board. Good to see you, Rob.>> How are you. Good to see you. >> So, that is a bit of a different question than the bubble question ...