Don't think the breaks are increasing, only the people whining about it…
Let them whine at breaks, their problem if they are bit dumbo dumbo.
Oda is busy man with family that does whetever he can for fans of his work. We should be happy that we get that many chapters a year. I would be even okay with getting for example 20 pages chapter every two weeks. Still would be awesome to get something like that, with even more polished art.
Oda isnt growing younger and he still is one of mangakas that work until somebody takes them to hospital where he very likely draws stuff when he can..
To anybody who complains at One Piece - there is awesome shonen manga that in some departments is even better than One Piece - its called Hunter x Hunter. Read it. Catch up to it and get to know what it means to wait for next chapter of great manga.