Is this as bad a I think it was gonna be?
After the Freiza saga, they're not official.
No, not based on a team in the beginning. But grew that way.
I remember reading some where years ago from one of Toriyama's editors, or maybe even the guy himself. He said that he added Krillin because of Goku's flat character. Then began the steady income of new people. I think for the better.
A lot that have done well so far, I think will begin to move down. New shows will start to take their place. However, DBZ will still be there, because new fans are always watching it.
I also think, whatever gets big in American in the news 2-3 years will be around for the next 10.
The more I think of it.
Piccolo will wait until the next tournament to display his power. Killing Goku in the process. Since it was televised. Dr. Gero will stop his vendetta against Goku. And continue with something else. Plus we don't really know how he got to 17 & 18. He might make a move too early now that Goku is dead. Not making these androids.
Piccolo will try for world domination. Gohan, would want to avenge his father. Kami, would train Gohan. Gohan, honing his skills under Kami. While this happens Bulma will be gathering the dragon balls to wish Goku back. Gohan will grow fast and defeat Piccolo. Probably to death making the dragon balls disappear (after Goku had been wished back).
I'm going with the possibility of Gero moving forward early believing Goku was dead. Is ultimately defeated by...Goku...again.
Like others have thought up. There will be not enough ki for Buu to be resurrected and will be moved to another planet. Most likely one with Frieza on.
Other things. Yamcha and Bulma would probably end up together.
Vegeta will probably kill Nappa at some point.
Frieza would make the namekians give him immortality as well.
I don't think he would have. The only reason Freiza was on the trail of the dragon balls was because he was listening to the conversation between Z warriors and Vegeta. Otherwise he would have done it already. Unless I missed something.