Yes, seriously. Which company is anyone's guess, and some are more likely than others, but it's conceivable a single company from that list could achieve a $200B valuation on a 5 year time scale.
My point isn't really to take anything away from those companies. They're all very impressive. It's more that I am surprised that people don't seem to think that $200B is an incredibly large amount of money. It's more than three Ford Motor Company's. Or $80 billion more valuable than Cisco Systems, in many ways the backbone of the entire internet. It's just an incredibly large valuation to achieve for any company let alone in a five-year time frame.