Because, naruto went downhill after shippuden and op powers was showed up in series/manga? Naruto was same power lvl as Goku.Why did kishimoto decide to end naruto?������
Dragon ball fillers I don't know many but tiens first apprence filler,goku and chichi at the end of db and their wedding filler gokus training with kami going back in time fillerLook as i said in other topic, TV company can decide to make gaiden series like with Dragon Ball GT was done, but Toriyama didn't created GT after all so ssj4 don't excist at all.
Same can go for gaiden if rating gonna be blast they can think about it and make seperate team who will creat new series and story. But who knows maybe it's over for good.
Plus naruto had more fillers than any other manga lel even dragon ball/Z had no fillers lel![]()