I don't think so.
Before the situation comes, banks will adopt blockchain technology.
No. Blockchain is a technology while bank is an organization. They can't replace each others.
Talking nickname. I definitely should believe such people

Really I agreed that we try to mix technology and people formation. Blockchain need people and interface at least. But who will do KYC or any check? Who will says about how it work? I wait some changes from blockchain implementations but not so fast and big