I am concerned about future care for my 42 year old son who has severe physical disabilities.

I am concerned about future care for my 42 year old son who has severe physical disabilities and relies on power wheelchairs for mobility. He is also a college graduate, very creative, and drives his own van. After conducting a recent search for personal care for my mother in law who has dementia, I was disappointed to learn that even assisted living facilities said they would not accept my son because he must use a power chair. Some places said they might even consider him as a younger than normal resident until they heard he must use a power wheelchair. Our local county CCSP department has not been much help - I would have thought this issue must have come up before. Is a nursing home his only alternative?