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Hello from JustAnswer.
Without being able to perform a neurologic exam or reviewing any of the imaging studies, it is impossible to estimate the odds of recovering the level of quality of life that you mention.
However, it can be definitely stated that his quality of life will be better with physical therapy than without physical therapy. Even if he remains bedridden, physical therapy can help to improve some level of motion and muscle tone and decrease the risk of many complications, such as contractures. In someone with a more severe neurologic damage, simple range of motion exercises that can be done by the family may be the most important physical therapy. But if he has not had an examination by a Neurologist or Physical Therapist, there definitely would be some potential for an improved quality of life, even if it is unrealistic for him to achieve the ability to walk limited distances.
Is there any further information that would be helpful?
Please let me know if I can provide any further assistance.