Most of the people of this world couldn't care a damn about currency.
They have enough trouble trying to put food on the table and feeding their families as it is.
Some "world currency" will probably not make much difference to their lives.
The only ones worried are the peoples of the rich nations about their wealth.
Besides according to others the world ends on December 21st,2012
So they have just over two years to bring this "world currency" in.
Well at least London will get the Olympics over with by then.