Because Johnny Crawford was getting older, and starting to record songs and doing other acting roles. The shows ratings also started to drop after Season 3, when Milly left the show. They knew the show had to end and Jonny Crawford & Chuck Connors decided to finish it out.
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Heroes isn't going to come back. I know, that sucks. The show was abruptly canceled due to the loss of a viewers. However, I heard rumors that there will be a movie coming out so the show wouldn't just end on that cliff-hanger; if they can be sure it would bring in money, I'm sure. But don't loose hope!
iCarly has its final episode November 23,2012 @8/7c. It is so sad that the show is ending.
CBS cancelled the sho so they good fit in more.
ummm it was because of Eric and kelso they were bored being in that 70 show so they said lets just end the show because they were looking forward in their movie careers
The show is not going off the air because of any ratings or falling viewership. But the story has reached a sort of end now. So its a wise decision to end the story in glory.