We are already our bank of bitcoin and crypto currencies, sure we do use some wallet from some companie, but they havent control over it, they allow the acess and to use and collect their fees, i dont see the point really to get a bitcoin bank, unless they provide interest of 10-20% years from the deposits, but those wont happen. I do like freedom, and i get interest lending or trading or making my sport bets.
Let's remain realists and refrain from distorting the facts
Why don't you guys just make a mental effort and think about this a little better? Coinbase alone is reported to have some 4.8 million users and 10.6 million wallets (as declared by the IRS). This basically tells us that many bitcoiners are heavily using web wallets. And I won't be surprised to learn that actually a total majority of bitcoiners are using these services in some way. But web wallets are just one step behind from turning into a Bitcoin bank. So if people are massively using the said wallets, and they are paid essentially nothing (if we don't consider free of charge transactions), what makes you think that a Bitcoin bank offering, say, 1-2% annual interest is impossible and should necessarily be a scam or HYIP?
Few elements to go a bit further in what you say:
1/ I don't know the number of bitcoiners and wallets around the world. Maybe it's common knowledge so you didn't took the time to precise it but if we got 100 million users then 5 millions in Coinbase isn't much
2/ The main point of bitcoin is to get rid of the fiat system which means that banks in bitcoin aren't impossible. You're right on that.
3/ You can have 5 millions users and 10 millions wallets, the important thing is how much btc you have? Because those wallets are maybe mainly used for small amounts. I, for one, have opened 9 different online wallets while I discovered btc. Today I use only one and i might have something like 20$ on it. My btc aren't here but in (relative) security on my computer, only very small amounts "just in case" are available on my online wallet. There is a difference between creating and using a wallet for 20$ and actually putting your money on it ^^
Btc banks might exist yeah but what would be their points? Main goal of traditional banks is to provide the fiat service. We need them only because we need to be able to receive money on our accounts and send to others and pay. With btc you don't need a bank to do that, so what would be the point of banks?