They would have to incapacitate Garlic Junior somehow. As for Gohan, Krillin, and Piccolo, I’m not sure they would be able to bring them back to the same universe with the Dragon Balls.
I definitely think that as TV Shows in the 2000s, Dragon Ball, Naruto, and Bleach were mainstream. One Piece was mainstream as a Manga, that’s why it was part of the Big Three at the time since that term referred to mainstream Manga.
My bad. I misinterpreted the definition of one hit wonder. My opinion on it making Anime and Manga mainstream still stands though. Dragon Ball and The Big Three were mainstream Anime and Manga too, but they didn’t make Anime and Manga as a form of entertainment mainstream either.