Sir)) you have your bitcoins in the wallet. what interest you can take?
Zero.
if you have 1 BTC, 1 year later your wallet will contain 1 BTC.
Yes, but this 1 BTC may be worth $800 by then.
If you put money in the bank, your account will increase to 1,15 BTC, for example.
That would be 15% p.a., for example. That doesn't even qualify as delusional.
Quick reality check:
http://www.fio.cz/docs/cz/urokove_sazby_FO.pdf0.25%
Also, where you can take a loan? From another your account? of course you can do without borrowings
Of course I can. How did you know?
Bitcoin extends and complements the banking system, not breaks it down.
Bingo! And therefore, you should try to find some application in this "extending and complementing" area. You will not be successfull in the traditional banking area. Because - guess what: That's where the banks are. It's way easier for a bank to integrate Bitcoin, than for a poor (sorry everyone with less net worth than $1M) Bitcoin-Fan to become a bank.
http://www.coindesk.com/bitcoin-de-launches-integration-with-fidor-bank-accounts/http://www.coindesk.com/fidor-ethereum-core-banking/Rico