I am sorry but I don’t think so it’s great idea. We are already having banks for fiat and paying high taxes over our capital. Banks basically control our money. Bitcoins are fine in wallets. At least in this way only the owner has access to his bitcoins. Furthermore I don’t think majority is going to support this idea.

we  experience the financial freedom  that is given by BTC to us , we all know the value keeps on fluctuating a lot and we all use bitcoin wallets to store our bitcoins there with all of us having the backups of our wallets .

then why should we have bitcoins banks for interest ,  no we alredy have a fluctuating values and if any banks offers interest on holding bitcoins they would run into loss if the prices go up. so why would any bank do that.
well we have secure wallets with private key and seed for securiy then why should we need a bank to save them for us . well banks would be able to know our balance ,our transactions and before creating accounts we would have to agree with their sets of rules and regulation.
bitcoins gave u finaial freedom so wh should we lose that by allowing banks to save our BTC.
 

Well, no one is forcing anyone to hold their Bitcoins in the bank. It is just a facility for those who are not capable of maintaining security in their web or desktop/smartphone wallet. It's less about interest and more about convenience to that class which won't even look for Bitcoin unless they have some support mechanism throughout the process. Yes, Bitcoin is decentralised and I support that principle but what about them who are not able to hold or spend Bitcoins on their own?

I agree with you, it would be much better to store bitcoin in the wallet, rather than store it in the bank, and security issues we do not know if we keep our funds there, but if we keep it in personal wallets at least security we can know ...