In years to come, maybe. But not any time soon. Every year as more and more kids discover the internet and YouTube, the audience for YouTube videos grows. Not many people just stop watching YouTube either. It appeals to mass audiences. Unless something comes along that becomes the new thing and sort-of beats the internet (like the internet has done with tv, and tv did with radio) and can take a large chunk of YouTubes audience, I'm finding it unlikely that YouTube will be going anywhere. It will still remain relevant though, as it's a medium that many enjoy.