Hardly. Zoella's last video, for example, has 1.3million views. If that's "dead", then I'd like to know what "alive" is. She still got paid a grand from that video, going off of YouTube's monetisation model. Sure, her average monthly views have gone down, but this is due to her uploading less due to being busier with her other businesses. It's the same pattern with other YouTubers that have seen their monthly viewership lowered - they upload very regularly to increase to gain viewership and boost their business platform, and eventually they focus more on their own products and businesses and start uploading to YouTube less because focusing on the other businesses brings more money in than uploading a video a few times a week. So these so-called YouTubers that are supposedly "dying" are actually financially doing better than ever, with their YouTube channel now just being a side hustle, in essence.