I am very much in favor of some of the things you suggest (particularly dedicated threads for discussion on each new movie) and I think it would probably go a long way towards improving the real-world value of the community. I think this is particularly true as it seems unlikely that with 1.1k subscribers the community has totally filled this niche.

Do you think there is any way !moviesandtv@lemm.ee would consider some sort of deal wherein they moderate and run this spinoff community with more structured discussion, while you link to and officially endorse the community (of course contingent on ongoing good relations)? Thereby not adding any additional workload but bringing more overall value to the community members?