Honestly, I did not know the anime was cancelled from long-running. This corresponds suddenly with the new pacing in Elbaph, which appears more in line with old stuff from around even as early as East Blue, where we had a direct simple plot structure and all the side-lines and sight-seeings had ulterior purpose and fulfilled multiple functions.
The Walrus school, for instance. It set up the entire conflict with the children, introduced their teachers, while also being the background for Saul's entire absence from the modern world in a way that actually makes a certain degree of sense (remember she was public enemy number 1 for ages, next to Dragon himself, basically, and was nearly impossible to find. People complained about it him not trying to send word, but remember that Saul himself was only left off the CP hit-list because Kuzan basically reported him dead...). I mean, we assume he knows she was with Dragon all these 2 years. But she wasn't publicly stating it and Saul was definitely in hiding himself to ensure the books remained hidden. I doubt he had any real reason to seek her out and his waiting for her when he realized she was basically destined to reach Elbaph some day, seemed more wise than not. It isn't like he is her surrogate father, they were just friends who met and parted in tragedy.
Either way I'm hoping for Elbaph to not go beyond 60-70 chapters at most. If the anime is no longer a marketing threat to Oda, I see him being aloud to work peacefully. So far, my theory that this was a pacing issue seems to be true. We will have to wait until this arc concludes to determine if this observation holds any water. It certainly will be telling if the anime is now seasonal. (I need to go check on this. Where was the announcement of its cancelation? When? And what are the terms of the anime's renewal? Is it going to just return to the ongoing schedule?