There is an enormous amount of information about science readily accessible to anyone who wants to learn it. Perhaps many people just don't care about science. If that's true, forcing them to learn it probably isn't going to accomplish anything.
Also remember that the "competition" also has access to the same free information.
Even if you ignore the visual/textual/etc. distinctions, they have other properties as media; for example, textbooks are easier to use in a random-access/skimming manner than videos, and can be more easily taken outside or marked up. It could just be my concentration, but I also can't get through watching a YouTube video, while somehow I have no trouble reading through a book.
Even if you do learn reasonably well from video, you:
* Need to know what to look for
* Need to somehow know which videos are made by people who know what they're talking about
The same applies to text.