Let me phrase more precisely: as a result of this, there is not going to be any paywalled content created that
otherwise would have been created as free ad-supported content. There is only going to be paywalled content created that otherwise would have been paywalled somewhere else,
or not created at all.
Media entrepreneurs set out to run a certain kind of business, revenue-engine-wise; and they choose their distribution channels by what will allow them to do the revenue model they have in mind. They don't compromise on their plans by choosing a channel with a larger reach but an entirely different revenue model. If they can't start a business with the revenue model they had in mind, then they just don't start that business. (They might start some entirely different business that does fit the revenue model of the channel; but that'd be a ground-up re-think, and probably have nothing in common with the original business.)
A TV-series creative planner doesn't "compromise" when they can't get their TV pitch greenlit, by turning around and making a Hollywood movie or "direct-to-VHS" miniseries instead. Those are entirely different revenue models, and so require entirely different development strategies — different budgets, different teams, even different content!
Same with educational content. You don't put the sorts of courseware videos you'd publish on Coursera, on YouTube as ad-supported recommendation-discovered videos. They don't belong there. People won't watch them, and you won't (currently) make any money. (For one thing — as another comment thread here attests — they aren't designed to be clickbait in the way that YouTube videos are, so they'll be ignored by the recommendation engine.)
If you're already creating that type of content, you're currently creating it for some other platform where it works, and ignoring YouTube. Now YouTube will be one more "platform where it works." That doesn't change anything about whether you will have made this type of content. It only (maybe) changes how much money you'll make doing it, and so moves a few people over from "not creating educational content at all" to "creating courseware on YouTube." Just like happens incrementally every time one of the other dozens of such courseware sites pop up.