There have been a lot of very successful and profitable media companies[0]. The industry isn't broken (far from it), just some of the models are.
This also isn't a new revelation: Arrington wrote a post on TechCrunch in 2008 warning other bloggers not to raise money[1]
Re: the effectiveness of advertising. This is a $120B+ annual industry with entire billion-dollar sub-industries involved in measuring its effectiveness and optimizing value. If it didn't work it would have slowed, shrunk and or shut down a long time ago - but rather it is growing insanely each year. Advertisers and the over-qualified engineers working in adtech are not idiots.
[0] TechCrunch (disclaimer: worked there, profitable - sold), ReadWriteWeb (profitable - sold), Huffington Post (profitable, sold for $350M+), ProBlogger (profitable), etc. etc. etc.
[1] http://techcrunch.com/2008/03/19/more-bloggers-raising-money...