...people need to be given freedom to deposit their BTC directly just like the regular money.
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.
If cash or fiat system will continue to exist in the future, then what banks can do here is switch into becoming or offering exchange service like Binance and Bybit, where people can trade and buy their Bitcoin, and many other ways they can partake such as lending people Bitcoin where they payback later in fiat and profit off the interest or they can as well provide P2P platform for traders converting cash to Bitcoin, and Bitcoin to cash.