IMO doing a sequel is possible and pretty easy. We've seen the world of Gotham through Joker's eyes....and to him the politcians were shyt, Thomas Wayne was a piece of shyt and everyone who he killed deserved that shyt. Now the sequel I'd do from Bruce's POV since he has a connection with everyone important in Joker. Use Bruce's movie to unravel and twist things we thought we established. Was Thomas Wayne really a jerk? Are the people of gotham really deserving of help? We saw the view from the bottom looking up top, that's why we hated those idiots on the train. Now lets flip...from Bruce's POV growing up as a kid, lets actually see how Thomas and his company legit tried to help the unfortunate....how the Wayne enterprise tried to do good but their efforts went in vain. It would add so much perspective to this "everybody is in the gray area" theme we got going right now.