If Fortnite gets replaced by another similarly popular fad after a few years then people still aren't watching Netflix. That's what Netflix has to compete against. I'm quite sure that's how the quote is supposed to be understood—not that Netflix expects Fortnite specifically to be their top competitor for the next decade.
Which is another way to say that Amazon is their competition, considering Twitch's integration with Prime - and Amazons investment into gaming with Lumberyard and AWS. I suspect Unity was acting defensively against AWS with their license change, with Improbable caught up in the middle. Just speculation.
