Hence with 1.7 billion people staying unbanked, added to the increase of people who don't rely on banks, Bitcoin provides them with numerous options why they should use bitcoin for different purposes like sending money to relatives in different countries at a very low fee.
That's some unbelievable information, i am from pakistan and i do understand, many people prefer to send money to each other using phone number and ID card instead of banks, even somehow they find a cheap way to send money into Pak, without using Banks.
Tbh, i think BTC and banks have direct relation with each other for example before entering into crypto verse i do not have any bank account, and when i started to earn some money and when i exchange it to tokens then i have to use bank's ATM, so for some time i used my friend's bank account, because i merely gets reward and when i do so instead of making my own bank account i prefer to choose my friend or any of my relative account.
The point is, once you get involved in crypto you will make or depend on a bank unless you give highest priority to anonymity and do not want anyone to know that you are involved in crypto.
And i do agree with your last statement and it was one of the main factor that convinced El-Salvador to accept BTC as Legal tender. Btc will open a lot of door for business but in my POV, for people to come in Crypto/btc they first have some knowledge of banking sector because that's how they will understand the benefits of Crypto (when they will understand drawbacks of banking sector in todays world)