Plagiarism is definitely not worth spreading, however it's a mistake to call all derived works, works that reference others (e.g. for criticism and review) and even copied works "plagiarism" - apologies, you used the term but I was referring to derived/copied works that still give credit to the original author, I should have been clear about that.
I'm not saying that people who produce content should have their works immediately copied and shared, that's what I meant when I indicated that copyrighting these works for limited amount of time is a good thing. And definitely provides incentive for content creators. What I am saying is that this limit should not be forever, or even a 'long' time. The reality is that a lot of content/material is not even owned by by the original author, but rather by a publishing company, record company, etc. Yes the author is still likely to get paid for their work, but proportionally the profit earned from the work is much less in the favour of the author.
The uneducated masses are the people that cannot afford or do not have access to higher levels of education. With the current trend these people will be less equiped to be able to consume and evaluate quality sources of information, if they will even be able to afford it. It feels as though average people's consumption of information will gradually be more and more limited. Before we used to more heavily rely on public libraries. While it's true that most people could not afford having all of the books or even most of them, they were allowed access and under fair use were even permitted to make copies of books, journals, etc. available there. These content filters have so far offered very little in the way of protecting that fair use as far as the internet is concerned. The internet may not be completely wrecked, but IMO will be damaged as a result.