User blog comment:Kaido King of the Beasts/Future of the One Piece Anime/@comment-25926617-20150825045653/@comment-8823907-20150825103010

But they can have funnyand interesting filler. Like the G-8 arc you mentioned. Or the water-7 special episodes. Those were fun. Or do some sort of a gaming/competition arc like the Foxy-pirates ( i know the foxi-pirates werent filler). I think a lot of the time  people dont want to see Luffy and Zoro strugling with a sub-par enemy whom they knock out in three seconds in the last episode. Insted Challenge the Strawhats or put them in funny interesting situations. The problem rigth now is that after Dressrosa you cant have a filler on Dressrosa because everyone is in a hurry to get to Zoo.