A currency is a tool - it's not a system that people have learned from birth. To switch from one currency to another requires only minor effort, and it's not possible to continue to using the old currency when everyone else switches to the new one.
A language, on the other hand, is something that people would continue using, and you couldn't simple mandate that everyone switch to a different language, they'd simply continue with the old one. Any government that tried to tell people what language to speak would find itself out of power very quickly.
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Re: a more serious poll
A language, on the other hand, is something that people would continue using, and you couldn't simple mandate that everyone switch to a different language, they'd simply continue with the old one. Any government that tried to tell people what language to speak would find itself out of power very quickly.