Second that!
It would be nice if the world used one currency. No more getting the phone out to work out how much something costs in a foreign currency.
That is a bad idea for forex traders. They will lose a lot of income if that happens. Though it seems to be a good idea at first but I think it is better if there are a lot of cryptocurrencies and fiat currency. So that there will always be a competition and we will always have a choice on what to use.