200 lines = You're a bank now.

[ImHash]

Is that true ? , Some news portal also reported that in December 2017 the Russian banks will be hacked by some famous hacker, this threat has been well publicized. the possibility of what would happen if this were true?. Just 200 bytes banking system of the world was destroyed? , Like a domino effect falling. now, I fear war. whether these threats have political elements?

You are way out of this world dude, it's 200 lines of codes not bytes, doesn't have anything to do with war and hacking, it's about the fact that the entire summary of bitcoin base code which blockchain needs to function is nothing but 200 lines of codes give or take.
And amazing part is where all of them depend on each other and been wrote exactly in a complicated way to be a system as a whole.

Now imagine bitcoin been improved over the past 7-8 years developed a lot and even more and more code added to the original base code, it's not like the same as before when Satoshi released the source code.

[Reid]

What cryptocurrencies replace is mostly the mathematical and technical bases of banks - their "apps" that they sell to businesses and general public. For example, bank accounts, saving plans, payment solutions, etc.

But banks have other functions in which they most likely will prevail and lead even in a blockchain-ruled world. The most important are related to risk assessment. For example, they decide who can get a loan and who not, in which asset they invest, etc.

By running a blockchain application like Bitcoin, you won't get that "feature" of banks that easy (you must actually obtain the necessary knowledge yourself). There are concepts like Ripple (and the upcoming Wetrust) that try to do a very basic variant of this kind of risk assessment, but it's currently not known if really all functions of banks can be replaced by blockchain apps.

I agree with this.
They will be more powerful with something else and that includes average people who cant afford to have this things or wont have time to think about that.
With their jobs keeping them busy they wont care about this things. It will be another work for them so they want someone to run it even if they need to pay. That is one thing that is good about a bank.
Someone is managing it for you.
So I think this will just work for us who have knowledge about it.