Nope...they haven't yet, and I don't see the mass market becoming more knowledgable faster than the rate of increase of viruses and spam.
The study and the article seem to me to be making that prediction based on current trends: i.e., if we don't do more than we're doing today, the amount of crap on web and email will so exceed the useful stuff as to tip the cost/benefit ratio of the Internet towards utter uselessness. Note that the overall conclusion is that we need more proactive action towards making sure this doesn't happen, not that it inescapably WILL happen. Which is pretty much the truth.
Haha wow... And that's coming from the guy who invented ethernet! Guess I just don't understand how you'd want to invent and elaborate on something that is so closely tied in with the internet only to predict its downfall...