As much as I would've loved a fourth season and for the show to be continuing today, I think 3 is enough given the lore was wrapped up comprehensively in both the finale and the journal. I can't really complain about a "short run" if the series ended on a high note. My only regret is I wish I was a fan while it was still airing, but since the entire series has been made available on Disney+ and other streaming services and new official media being released post-finale, I'd say better late than never.
But with Matt's openness to continue the series if art book sales are successful, I'd say we still have a chance for a revival focusing on the frogs' lives post-departure with Sprig and Ivy exploring the new continent. It may not be the same as a Calamity prequel or timeskip spin-off for those like me who got into the show for the girls, but it'll still be something if you came to appreciate the show altogether including the frogs.
