I remember reading on reddit rumors 2 months ago that they were looking at getting the show through Waters 7 arch for a sorta clean "series finale" feel. I know Season 4's approval is completely based on season 2's performance.
Regardless the shows Season 1 did the job and made me interested enough to start watching all the animes

, and they are good thankfully, so we'll always have them. Also for anyone who liked the show, I highly recommend jumping on the anime, it can have some filler, but damn if it gets damn good during the Alabasta arch.