IMO involving an OT only makes things worse. Best thing is to tell people that they are alright. If there are other issues, such as mood/psychiatric, then you refer to those services. If people erroneously believe their problems are due to a concussion that happened years ago instead of a real psychiatric issue currently, goo luck treating that successfully.
Many of my concussion cases are 4-10+ months post injury/accident....so the vast majority of cases wouldn't be appropriate OT / PT / SLP referrals, though on occasion there are still some things that can be done. Usually I recommend talk therapy and spend some time talking about what is involved, provide additional education about expectations of rehabilitation/recovery, address exercise, provide education and help with sleep hygiene, work with the PCP/referring physician on meds, etc.
Really? you don't feel there's a benefit to rehab or adjustment after the acute stage, once they're home and trying to figure out how to drive, shop, etc? i'm kind of surprised to hear this.
i know someone who suffered a stroke that blew out occipital areas (and a few others, i don't know for sure which) who 5 to 6 months afterwards, still needed help adjusting his life activities as aspects of his condition changed and different strengths and weaknesses were brought to light. boy howdee was it was tough on his wife. (he was not driving, obviously. but getting around the house, engaging in leisure activities - different story)