Toriyama originally wanted to end it at the end of Freeza saga, the fans wanted more. He then decided to end at the end of the cell saga, guess what? The fans wanted more. Even after buu saga the fans wanted more, but he didn't care, he was tired so he finally took a stand against his editors & fans and took a much deserved hiatus.
Fun fact: Toriyama also wanted Goku to remain deceased after the cell saga, and let Gohan become the main protagonist with only flashbacks and brief cameos of Goku. That is the whole reason the concept of Goten looking like Goku was created. However the fans & editors disliked the idea of no more Goku. A.T had basically no control over his manga & it would have ended very differently if he didn't let the editors & advisors stomp his original vision of his manga.