There is a big difference between watching a piece of content on television and online (Youtube for this case in point). Therefore you must make content for the medium, content producers must understand the difference.
The two differences are the mindframe of the audience and the context of the content.
Mindframe of the audience
Your audience is active when they are online, when they are watching television they are quite happy to sit on a couch for 60 minutes and not do anything except light a bewg and watch CSI.
However online they have many more distractions and they're not used to watching content for longer than 3 minutes. One of the leading online content creators in this country 'Community Channel' has worked to decrease the time of her videos realsing the audience has less time to watch.
Context of the content
Content is also placed in two different environments, online it has a title and description of what is happening in the video, there is also related content sitting there waiting to distract you. It would be the equivalent of watching television on a screen that lets you see what is on all the other channels at once. I do not know many people who watch television like this.
Some examples of Good Content which is not always good content
The Wire – would you watch this online for an hour NO, would you sit back on the couch and watch the whole of season 3 on a Sunday afternoon, YES
Would you watch this online? YES would you watch it in show for 30 minutes of similar footage? According to Australia probably not, until Funniest Home Videos it would be safe to assume that this Australians do not always want to see this type of content on television.
Thanks three billion for making me pen my thoughts