Okay....so it seems we get 12 episodes a season with this bundle. Let's say it's usually 1 episode per 2 chapters. Here's my guess for what's going forward:
1st season: the ghost boy hanako arc, mistaking stairs arc, (young exorcist arc/^*somewhat), 4pm bookstores arc, Mitsuba arc, tea party arc, hell of mirrors arc, little mermaid arc,
2nd season: the three clockkeepers arc, summer lights arc, picture perfect arc,
3rd season(2nd season 2nd part): sacrifice of the grim reaper arc, red house arc
4th season(Season 3): far shore arc, nightlife arc, and the omen arc
The remaining chapters of the arc we're in now only make about 8 episodes, and we're not even out of the dark woods yet. We have at least 4 more episodes (8 chapters) until the arcs concluded.
Not sure how much left of the manga there is? Could there be eight seasons like Mha, or are we nearly done?