this is somewhat preferable than having a chip implanted on the body. also, having a government id chip is a good idea too for identification purposes.

and with the question of the op if bitcoin "will it get accepted as a second currency?"  it is already for most of the country. you can visit netherlands or research about it. in arnhem city, there are so many shops down the city who accepts bitcoin as their second currency.. its not only netherlands but so many countries already doing this.