User blog comment:Dracoliche/Things to come.../@comment-24053170-20190731200605/@comment-24053170-20190731210233

Also the Authors remaining family owns the rights to the series. So unless they can get approval from them (which isn't going to happen), then there will never be another series.

Besides you apparently missed something very important in your argument, you can't just create new material without the authors input first and since he dead, a new series literally cannot happen.

Any series were the author has died will remain incomplete unless they have personally taken steps beforehand to complete their work.

And some multiple season series will simply never be made again....like Lupin the 3rd.