While I have agreed to option B, I'm not sure if it will change the world. Blockchain is indeed a good concept and has potential to bring about changes. It is not only applicable to banks but beyond banks too.
But I see the hype is so huge and I'm afraid we will all be left disappointed because of wrong expectations.
I'm also worried about the performance and cost aspect of it because that itself can be an issue if it has to be adopted by the masses.