No, but they will be if Google paid too much on the servers. YouTube is very popular, but don't rely on YouTube too much. You'll see YouTube trolls all over the website, and they are hard to get rid of since YouTube has more than 5.5 million users online.
I'll give you an advice: Don't be a YouTube troll, or you'll be frowned upon and be hated. That is because nobody likes internet users in a group of attention needing pricks. You don't want to be like them, I am begging you.
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You tube is way to awesome to EVER end... I believe that soon when computrs and internet mean nothing to us... they will shut down ALL web-sites... And sadly, that includes youtube
*sniffles*
:(
Nope, this was an April Fools joke for the 2013 year. YouTube is expected to continue thriving and growing and will not actually shut down in 2020.