They are, as is One Piece and pretty much most anime featured on Toonami, at least in the states. But plenty of fans for OP, Naruto, and Bleach worldwide.
Not quite sure if they are quite as popular as DB because they are not as old. Popularity + Time = FABULOUUUUUSSSSS!!!!! But no really, when it comes to series that are all mega popular, the oldest one will be more recognizable.
Some exceptions exist of course. Whether it be the games, anime, or both, Pokemon is even more recognizable than any of them, DB included. But both DB and Pokemon are older than the other 3.