I don't know, Ridley's historical epics haven't been great in a while: Robinhood, The Last Duel, and Napoleon. I fear Gladiator 2 could be like the sequel to The Robe starring Richard Burton, Demetrius and The Gladiators did not do well because the principle character died like Maximus died, and placing a minor or supporting character in the limelight doesn't fair well, look at The Lost World: Jurassic Park, Cars 2, and Finding Dory. There are characters that thrive as supporting characters making quips, lore dumps, and etc.
I think Scott should have left alone his best epic film. It should be standalone, its Maximus who was the heart beat of the story, and now his heart has stopped as he is in Elysium.