Despite recent attention to the implications of giving Facebook full access to our online lives, I don't think it's shifting the average person's thinking about their use of a centralized, closed-off version of the web. For most people, the affirmation that there is no real alternative to Facebook doesn't mean they leave Facebook, it means they keep using it until something else comes along.
Of course, there is an alternative to Facebook and other walled gardens: the open web. The alternative is the version of the Internet where you own your content and activity, have minimal dependence on third party business models, can discover new things outside of what for-profit algorithms show you, and where tools and services interact to enhance each other's offerings, instead of to stamp each other out of existence.
But most users don't care about the principles or implementation of an open web, at least not in those terms. Most people don't see themselves as ever having left the open web behind, and if you told them to try to get back to it, they wouldn't know what to do or why it was worthwhile.
No matter how much it might be in their long-term self interest, it's not up to the casual Internet user to figure that out. Instead, it's up to the developers, designers, entrepreneurs and technology leaders to create a version of the open web that also happens to be the best version of the web.