My nephew had 2 acl tears and a meniscus tear. The 1st acl was in high school and the second was during his sophomore year at Indiana while on their basketball team, as well as the meniscus his junior year. But it didn’t derail him, it just forced him to be patient, which is hard. He’s now playing professional basketball in Europe. He has been completely healthy now for 2.5 years. His name is James Blackmon, Jr if you want to read about his story.
I write all this to let you know what your son will come back and he’ll be great. As you know the rehab is very challenging, but he’ll persevere and be stronger as a person for it. James really has learned how to listen to and take care of his body and will likely play pro ball for the next 10-12 years. Your son will still achieve his dreams, delayed a bit but not lost