Having control over our money is a must. No bank assure it, whereas bitcoin gives assurance of the same. For different purpose we're in need of the banks, but it is always good to know our limits and make use of the banks. Another thing, all of the sudden banks won't close. We will come to know about the situation of the bank, if something is bad just withdraw entire funds. Very few exceptions happen same as that happened in Ukraine and Russia due to war.
For now, it looks like we still need a bank because many of us cannot use bitcoin directly as a means of payment. We also need bitcoin as an investment tool and our own bank because by storing bitcoins, we don't have to pay various fees like we do when we deposit money in a bank.
And we also cannot immediately withdraw funds from the bank if something bad happens to the bank because we have seen several cases where the bank asked for time to provide the funds. So we should have our own "bank". In this case, the presence of bitcoin has helped us a lot in having our own "bank".