many are pessimistic that Bitcoin will be able to shift conventional currencies both at the local and global level, will there be a miracle of bitcoin to shift conventional currencies
Not gonna happened. Bitcoin is created to have a decentralized aspect of peer to peer where people can do trade without any intervention of government or any centralized authority. I myself started to like the use of blockchain rather than relying on bank for some reason. Maybe because government can freeze your account if they suspected you of something. Unlike on blockchain that everything seems transparent and also the anonimity is there for anyone who are not into broadcasting their asset.