i dont think that can happen
because it has a different protocol
cash is physical while bitcoin has no physical form
so i dont think it's possible

No. I don't think that will happen. Now the Bitcoin legitimacy hasn't been clear. We still haven't had any idea whether the government will ban Bitcoin or not. So banks, which are under the control of the Central bank, are far from accepting Bitcoin as a deposit.

The time that bitcoin would be accepted into our banking systems is quite far fetched but i believe a time is coming where banks would really accept bitcoin. Currently so many governments are putting up regulations to control cryptocurrencies especially with issues concerning its volatility. I believe in the future bitcoin is likely to be accepted as deposits in our banks.

It is possible to happen because we all know that bitcoin and other cryptocurrency is getting more popular all over the country and there is no doubt that a lot of big banks will totally accepts bitcoin deposits, on the right time maybe it will only take for 5 years to happen.

As per the fixed price, it will be useless if the banks offer this type of investment more especially if the bitcoin goes up and you will only get half of what you deserve and vice versa, if it falls down the banks will have loss. More probably of the banks accepted bitcoin they need to establish rules and regulations that will favor the both party and therefore they will get the equal benifits. Bitcoin did not aim to have competition its just that people think of a competition. Bitcoin wants to help, and so that was its advantage. And soon banks will realize it also.

Even if the banks won;t accept bitcoin deposits, it wouldn't matter since bitcoin doesn't need banks. But if think they won't for now as bitcoin's value is not that stable yet and can cause some loss to the banks.

Yes in south korea local exchange has offered bank payments to ensure that payment will reach to their office as to let the local exchange also give the clients an options to exchange his fiat money to crypto. Maybe this banks will going to realize how much they will going to earn accepting payments for the local exchanges for crypto. And they will soon encourage local exchanges to get their bank for any transaction processes for them to earn. But in my opinion bank will never offer bitcoin deposits. It will never happen because banks are only after for the centralize currency which is the fiat money.

To receive money at interest, you must give them at interest. Give bitcoins at interest no one will, because the payment is anonymous and then there is nowhere to look for the recipient. Even if the borrower tells all about himself and shows, then this asset is identified with greater risks, since it is impossible to call such a legal operation, and accordingly, the bitcoins can not be taken back too.

maybe banks in my country will not offer it, because banks in my country consider the existence of bitcoin is a threat to them.
so that's impossible for them to do.

That seems hard to happen. It's extremely risky. Governments hardly have good attitude towards Bitcoin as well as other cryptos. For those two reasons, I dare say that the possibility is very small.