Have you ever experienced surfing the web from within an organization where the IT department (well, management) has blocked access to sites such as YouTube? It is an interesting experience. What becomes clear to you after a while is that a site like YouTube is not just a site . YouTube is present more or less everywhere on the web as videos from YouTube are embedded on blogs, sites and RSS feeds.
It is a fact that more and more companies, organizations and users both share their own video content via YouTube and reuse externally produced video content from YouTube on their own sites. This means that organizations that choose to block access to YouTube are not just keeping their employees users from accessing video content at YouTube.com; they are keeping their employees from accessing is a large part of the information, knowledge and experiences that is communicated via video and distributed online.
It's stupid, just plain stupid.