Your first point seems to be conflating workplaces and individual talents in order to make a snarky point about tech CEOs. I mean, I get it, but the "giants" that sergiotapia was referring to clearly aren't the people who ran Bell Labs, Xerox PARC, SRI and BBN. (Also, to be persnickety, Tesla and SpaceX don't make any of their revenue from advertising sales, and while Amazon does have a growing advertising services business, it's still a pretty small sliver of their overall revenue stream.)
Your second point seems more reasonable, although I think klyrs makes a cogent point: the "giants passing away" now are primarily the ones who made their names in the pre-internet age. The next generation after them are the folks who were making their names circa 1980–2000, and we can hazard some plausible guesses. It may be too early to say yet who the anointed giants of 2000–2020 will be.
Your second point seems more reasonable, although I think klyrs makes a cogent point: the "giants passing away" now are primarily the ones who made their names in the pre-internet age. The next generation after them are the folks who were making their names circa 1980–2000, and we can hazard some plausible guesses. It may be too early to say yet who the anointed giants of 2000–2020 will be.