Definately.
For them to do a craniectomy means he had some serious swelling on the brain. I read earlier that they induced a coma on him (this is done using a medication called pentobarbitol) to keep the swelling down.
If he survives this he is going to have a long, and I mean long road to recovery. There will be a lot of neuro rehab, a lot of work just getting him back to the mental status he was before he got hit.
My prayers are for him.