I know it’s probably too early to say that. Jellyfin still has a long way to go. I used to like plex because its plug-in was developed using python, but I hated it because of its remote access. If jellyfin can support Python plug-in development, it will be easier to extend the function of jellyfin.
If IronPython ever gets their shit together and the host would run on dotnet core this might be possible. Otherwise I would say that it is next to impossible to have the current plugin system based on python. Mostly since the server is written in C#, and python is C. Bridging the two is a nightmare.