I had a similar thought, though I want it to take place before the embers of One For All fade away completely.

The ending to the manga sucked, and I'd love to see a final film as an epilogue of sorts. Unfortunately, the problem is who to use as a villain. Aside from All For One's doctor, there aren't any loose endings that would act as a compelling emotional hook

No way. I saw Horizon in theaters not once, but twice, and each time was just as awesome. Its not a complete film, but then again it's not supposed to be. This is a series uniquely crafted for the big screen, beautifully shot with a series of spiraling narratives to keep things fresh. I raged when they delayed the release of Chapter 2, but hopefully a new date will be revealed soon. I'm eager to see what happens next, and I will be furious if they dump this beautiful epic on streaming where it will be forgotten forever