Akira Toriyama said he was done with dbz. He even said that the fans remember more about it than he does!! Idk, he's just done with it. But, Ooishi Naho, Toriyama's assistant I beleive, has created new things for dragon ball like "Yo! Son Goku and his friends return" and "The Episode of Bardock" and also "Dragon Ball SD".
And GT wasn't fan-made, it was created by Toei Animation. Toriyama only did the character designs, and the spaceship.
In the past years Toriyama has been working on Dragon Ball Online.
And John is partly right. But he's wrong about the fact that Toriyama wanted to end dbz at the cell games. Toriyama intended to end dbz as early as Dragon Ball when Goku was a kid and even many times afterward!!
The fans just made up that he wanted to end at first with frieza, cell, and then with him wanting Gohan to be hero. All that is false fan rumors!!