Depends on the subject matter. The less popular subject matters still should be read in books.
Depends on how “popular” of a subject it is. There are plenty of subjects on Wikipedia that are not popular enough to have ever been published about in print.
I guess that’s the other side of the coin. I’m a Mesoamerican history nerd and a lot of the articles on Wiki are sparse at best on the subject or outright misinformation (repeated misinformation I see almost verbatim copied and pasted). I see your point though, without an easy way of archiving information a lot of subjects would and have fallen through the cracks in humanity’s notice.