no, it would be a terrible idea, even though the euro is doing good despite the fact that some of the nations that joined had poor economies, the majority of the economies that joined were well standing by themselves.  If we made a world currency than we would have to take into account the poor economies that would join (i.e. africa, mexico, most of south america etc..) \nwhich would drag down the value of the global currency and hurt everyone in the end.
Can there be a global currency ?