Although director Rian Johnson joked that he and his creative team considered leaving Finn in a coma for the duration of Star Wars: Episode VIII, rest assured that John Boyega will have plenty to do in the next main Star Wars installment once he recovers.
Whether this plot point is legitimate or not, one thing is certain: once Finn is healed, he won’t go on medical leave.
John Boyega has said that his part this time around will be “much more physical,” so it seems like he won’t be lacking for any action.