The man is clearly too ill and too focused on OPLA and other OP projects (movies, anime, games, etc) to continue working this way. Best thing he can do is just retire from art, finish One Piece's story as a long script (if he hasn't done so already) and hand over the script and art duties to a trustworthy assistant (*cough*Yusaku Shibata*cough*) who knows how to copy his visual style while all LOda does is supervise like he does with OPLA and the rest, otherwise we'll have another Kazushi Hagiwara or Kentaro Miura situation on our hands.
Moving OP to Monthly Shonen Jump would be ideal and would allow for more time in between chapters for him to work on OPLA, the films, whatever, and not fuck up his health, the problem is LOda nor Jump would ever allow it since it would mean a decrease in sales for their main bread and butter and so far nothing has really come close to taking the mantle of OP or Naruto yet to motivate Jump's execs from moving OP out. And if HxH after all these decades still isn't in MSJ, I highly doubt OP will ever switch to monthly.
Moving OP to Monthly Shonen Jump would be ideal and would allow for more time in between chapters for him to work on OPLA, the films, whatever, and not fuck up his health, the problem is LOda nor Jump would ever allow it since it would mean a decrease in sales for their main bread and butter and so far nothing has really come close to taking the mantle of OP or Naruto yet to motivate Jump's execs from moving OP out. And if HxH after all these decades still isn't in MSJ, I highly doubt OP will ever switch to monthly.