Even in the future, the banks may not treat bitcoin the same way as regular money, where they will now accept direct deposits in bitcoin. There may likely be some services and things customers can do with Bitcoin, but the banks will be selective. The banks will be experiencing low activities with their customers, as many will switch to self-custody. I feel the banks will have to do this because their existence and relevance will be at stake and threatened if they don't find a way to coexist with Bitcoin that will be taking over.