The main theory is that the producers are planning to come out with a full film based on the story of the show, although we don’t know when that might happen or what exactly it could involve. However, it’s a rumor that’s been enjoying a lot of attention from fans in general.
It’s clear that many people would be happy to see a full film based on “Downton Abbey”, as there is a lot of potential for that in the current story, but the producers have been keeping quiet about that specific idea.
Of course, there are multiple challenges up ahead if they really are planning to do a movie, such as getting all necessary actors on board. Schedule conflicts could make that very difficult, but we don’t doubt that the producers can come up with a way to make it work if they put their minds to it.
Plus, the film doesn’t necessarily have to use the exact same set of actors, and they could easily get other people on board if they wanted to spice things up. In some cases, they could even represent familiar characters with a new actor, something that fans most likely wouldn’t mind and which could bring a new angle to the way the story is being told. It’s always interesting to see how another person might represent a certain character and the way they behave around others.