#Great Security
Not your keys, not your coins, so you should know how to protect it.
#High risk=high benefits
Might be true for HODLer's.
#future primary money or alternative?
Nah, probably leaning on alternative more so as a primary currency.
#One world currency
No.
#It will be legitimate tool to whole world
Depends on the country, there are nation who are opposing it, but there are also that completely embrace or at least regulate.
#affect to democratic countrys economy?
Bitcoin hasn't been tested to whether affect a country's economy. This is still pure speculation.