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The blockchain is just a NEW money issue/ transaction technology which replaces the paper money print , anti-counterfeiting tech or swift protocol among banks. Nothing more. Bitcoin/ PPC/XPM follow a very old monetary theory several hundreds years agao, Gold Standard.
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The credit of central bank or government damaged because they are monopolists, and abuse their power to inflate money, they use the "incentive economics, full employment " as an excuse to get benifit such as election campaign.
The ever increasing FIAT supply temporarily keeps economics booming and hurt the economics body in a long run, sooner or later the crisis will come and natually the old chairman/president has already retired. (alan greenspan
)
People don’t trust the FIAT value in a long run, people will never believe central banks keep constant total quantity of blockchain based new FIAT either. Internet Cryptos will win because of central banks bad reputation not blockchain tech itself unless central banks lose their monopolist positions and compete with internet cryptos. In this case, central banks will be cautious about the value/buy power degrade issue.
So the key is monopolism vs free competition, as a sound competitor, you either
a) centralized + real ID revealed (ripple, BTS and coming IBM/FED cryptos, this is the way FA Hayek talks about private currency competition)
or
b) decentralized and anonymous(bitcoin)
Both feasible! I don’t think (b) has special tech advantage over (a) in a free competition environment.
But for Nu now, we are poorly decentralized because of only 4 LPCs. 
c) centralized + anonymous, that’s bad. people just distrust you.
d) real ID revealed + decentralized , this is good but not necessary.