Perhaps I want to talk a bit more about the author Yonezawa in my review.
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As many have already noticed, Yonezawa sensei began to move away from Koten-bu series in recent years and worked on other literature which explores darker and depressing theme such as abolishing countryside infrastructure in Japan as a result of ageing population. We have seen traces like that in Hyouka anime in the last few episode: as teenagers grow up and move to cities, the suburban area where our main character happened to live is destined to age and fall gradually. Chitanda in the last episode confess to Oreki that she will eventually return to this land as she felt she has the family responsibility to develop her homeland. I think, Yonezawa sensei might have felt the same way. He was sad to see his hometown gradually losing spirit, and wants to use his power, through his words and stories, to bring the spirit back. And it worked. Hyouka was set scene in Takayama (Yonezawa's hometown) and the tourists number had risen by a large amount even since the work's release! it encouraged teens and other young business to ripe in the area.
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I don't know if Yonezawa sensei will return to Koten-bu series but I sincerely hope so. I really want to see how Chitanda will get out from the emotion turmoil she is in rn. And 'I am curious' as to how Oreki will help Chitanda.
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P.S I visited the Takayama 3 years ago. There's Hyouka reference and fans footprint everywhere. There's even a Hyouka official map where you can go visit the library, school, the cherry blossom road, the market, the riverbank, etc. I'll definitely encourage you to go if you are a Hyouka fan! plus they have great beef and Onsen.