From the BBC on Jakob Nielsen's 2008 Web report: Web users 'getting more selfish'
In 2004, about 40% of people visited a homepage and then drilled down to where they wanted to go and 60% use a deep link that took them directly to a page or desination inside a site. In 2008, said Dr Nielsen, only 25% of people travel via a homepage. The rest search and get straight there.
Of course, this is nothing new. Anyone who has a Web site that isn't a blog or social media site already knows this. This is a big change in user behavior in just four years, and the trend is accelerating. Which begs the question: Why build any navigation or menus at all? The only links that people will be following before too long are the direct hyperlinks found within each piece of information.
If every piece of content needs to stand alone-- then why not design that into your architecture from the get-go, and save yourself all kinds of time and money in the process?