Revenue is a bullshit number. YT keeps its actual profits (which is the number that matters) a secret.
I should be more specific, though. I mean "dying" not in the immediate sense, that's why I said slowly and it'll be around for years to come. But the time where everyone wanted to be a YouTuber because it's easy money are over. You need over a million views per month, every month to make YouTube a viable career choice these days.
Lots of even big channels these days are largely and openly finances by Patreon or sponsors. That means that they are no longer tied to YouTube in any meaningful way. Which means the platform is now interchangeable and the moment a competitor appears with similar numbers of users, the content creators can move elsewhere.
I was there when the dot-com bubble burst (for some reason I hear that in the voice of Elrond in my head, despite it's not actually that long ago, anyway) - I saw first hand how quickly your entire business can disappear when your only leg is "I'm very popular and have lots of users". The first company I worked for went from "we're in the top three" to "we're a subsidiary of someone else and btw 90% of you can go" in a week.