This is something that I've thought about since Rogue One, having a film centered around an Imperial protagonist. Since Lucasfilm has said that they want to explore narratives not possible in the main Episodes with the Anthology series, this would be an opportunity to deliver a new experience. Would you want to see film centered on Imperial characters? Whether it is a Band of Brothers style film about a group of Stormtroopers, or about the story of an Imperial ace like Maarek Stele, would you go see it?
A hope I have for any Imperial centric movie that could come out would be that we would get new ships/squadrons from the film to be in Armada, much like how Rogue One gave us Hammerhead corvettes and the MC75.
If we got the Victory and/or Gladiator onscreen that would be fantastic as well.