There are strong connections between behavioral neurology and related fields like neuropsychology, neuropathology, and neuroradiology from a diagnostic and research perspective. As Thama noted, TBI is not something that most behavioral neurologists even deal with. There is a growing interest in behavioral neurology towards successful aging and harm mitigation, as lifestyle modification and various forms of physical and mental activity are increasingly considered for cognitive impairment and dementia. Vascular cognitive impairment (VCI) contributes to the presentation of many other neurodegenerative processes, and early secondary prevention could improve outcomes. So, while there will always be a strong component of behavioral neurology that establishes diagnosis and prognosis, there are current and future opportunities for treatment, both in secondary prevention and in symptom management.
Also, a lot of neurodegenerative disease has a strong neuropsychiatric component, and behavioral neurologists are very valuable in assisting in managing mood disorders, psychosis, etc. in diseases with neurodegenerative etiology.