I'll start out by saying I really don't watch alot of "online video" for the simple reason my connection speed just isn't fast enough. Trying to watch a YouTube video at max 255k down is rather annoying and frustrating. I spend the majority of time waiting for the video to buffer enough for it to play smoothly for at least 5 seconds.
I know when I go to a friends house who has 1.5MB down, thats all I do on his computer because its just like watching TV except for all the stupid commercials. The variety of content is a huge plus also. Basically if you can think of it, there is a video of it somewhere on the web to watch. Another reason is there is no "editing" involved. Its raw footage that is not touched, so you see the whole video, regardless of content and language.
If you have a busy life, then you have little free time like me. Online video is there always, so you never have to miss that. Having internet access at work is a great option as well. Can you watch TV at work? In most cases, no....You can type up a proposal or make some graphs and charts while surfing the internet. Its a win win situation.
This comment left by an anonymous person pretty much sums it all up to me:
In my view the age of the television is almost over! Broadband internet provides music videos, streamed news reports, live sports commentary, worldwide TV channels, radio channels, pictures to download, e-mail with friends, free phone calls, music downloads, games and more! In short there are just not enough hours in the day to explore all the things I want to do on the net! TV cannot compete any more and will die a slow agonising death.