Block-chain and the Bitcoin implementation may have the technical/theoretical solution for some part of the financial and banking systems. But will never be perfect because of one thing.
One tool, one technology can never solve a problem that is located in the human psyche and in the way the human being acts and thinks in consequence of his impulses of greed, lust, power and the logic that is deducted from his current knowledge.
Yes, with cryptocurrency you can hold physically the holder of your account and you and only you - knowing the password of your private key can change it.
Yes, there is no central/centralized/ authority that could stop you from exchanging your digital coins for fiat currency or some product or service.
But:
The price of bitcoin/and of everything else in that matter/ depends on the search and the offering, the marketing and so on.
The person that with the passing of time has collected one way or another a lot of bitcoins, that one that has a lot of fiat money could potentially influence the search and and the offering and could potentially FULLY KNOWINGLY CONTROL the price with his "entrances" and "exits" from deals in the market in the right times.
The normal traders could never possibly know first where the train is going and will be aware after the train has parted. This way the trainman could and will increase his quantity of bitcoins and paper money. This way - as one enthusiast say it - this will change from one sultan to another.
There could be no single law that is written somewhere that could impose that one person is "owner" of another. It is all human made.
If bitcoin expands and everybody starts to use it everyday and replace official money, despite the fact that the total number of coins is limited by the software, it will be much easier for multinational control, because of the control of the price
Until as a civilization as a whole we give "value"/weight/ to something external - item, paper, a number on some computer, we will not exit from this vicious, poisonous circle that is embedded in the way we live and exits.
