honestly a single currency can not be a good thing as with all monopolies there is no competition which leads to slow/nill product development.
what we as a community need to do is push for the development of wallets and apps that not only provide a function, but to make them work as easy to the layman and a child, only then will mass adoption begin.
You might be correct, although, I just have to disagree. I think what the world needs right now is a more universal currency, it would in my opinion stop large scale market manipulaiton