Gerald Green on-court production might be replaceable but his locker room presence is well known around the league. He will be missed IMO
As somebody who has dealt with a Lisfranc fracture, depending on its classification his career is most likely over. It takes a year of healing + rehab to even get to a point where you can walk and use the foot somewhat regularly again, however its less if just the ligaments are sprained. The foot will never be the same afterwards, especially if he has screws permanently in his foot, which is likely. This is one of the worst injuries you can have for a professional athlete, especially at Gerald's age.