Even though the cast is up for the movie idea, it might not be a bad idea to allow a couple of years worth of a gap between the series finale and the movie release. That gives fans some time to digest the finale and get excited for the movie that is going to be released at some point.
This last season is going to be just six episodes and it will end on Christmas Day set in 1925. If fans are not that crazy about the possibility of a movie, it was reported that there will be a spin off prequel of Downton Abbey. The prequel will cover the romance between Grantham and Cora, the courtship and the marriage between the two.
Back in 2012, the spin off was first offered as a book, but it was eventually picked up by ITV. Overall, the reception of the show has been great worldwide with viewership rising with each and every single season.