I do not think YouTube creates challenges for television because each is different. Especially when a TV with great graphics and HDMI chords for video games makes the TV more usable. YouTube is great for looking up videos, new songs or video clips. If you want to watch a show, YouTube is not recommended. Sharing videos through YouTube does not take away from the greatness of the television.
I feel the computer may be the only technology update that takes away from the TV. Before people spent hours on the computer, they spent it on the TV. Though people may have an emotional spot for the TV, the television has been known to be the reason why the radio is no more. What the computer is to the television is what the television is to the radio. New updates of technology take away from old forms and people move on.
YouTube has a slight advantage over television because you are able to choose from millions of videos or clips and if something is recorded on there, you can choose that as well. Music videos are on YouTube so you will not have to see it through a television, possesses great advantages for YouTube. Overall, each has its advantages and disadvantages.