I think that Bitcoin can be use as a matter of fact to be globally accepted. What is your take and which currency can you suggest to be accepted globally?
I do not like the idea of any currency being the only one that is used, it doesn't matter if it's named bitcoin or ethereum or the United States dollar, having a single currency will make the economy of the world a lot more susceptible to failure, so it is way better to have several currencies competing among themselves than to have a single currency.