In the Star Wars sequel trilogy, Disney hinted several times that Finn was force-sensitive. Unfortunately, the writers did not capitalize on this opportunity. Instead, they began writing Finn in a more insignificant role with each forthcoming film.
“Finn was going to go back to the First Order undercover and convince others to defect, and then they were going to lead an uprising of the poor class that lived on the ground on Coruscant. That was going to happen in the original Trevorrow version.”
DarthRumbleBuns posed the idea, “He should have left with Calrissian at the end of the second movie to gather help and support from other ex-stormtroopers then in the third one, it should have been stormtroopers that showed up like Rohan showing up on Pelanor fields. "
Another user added, “Hey, you know what would have made this interesting? A cohesive plot or character development or SOMETHING? YOU KNOW, LITERALLY ANYTHING BESIDES RANDOM STUFF HAPPENING ON AND ON FOR THREE HOURS???”