yes. I also think can bitcoin be the world currency, it will all look easy,
To make it a world currency, it needs to develop more than one year and be able to carry out operations without the Internet, but for now it will be an additional currency.
It will take time to develop coins to become offline transaction that will never use internet at all if this can be use to pay on local store then maybe this could be a global currency but since bitcoin is already are Secondary currency that we use to make online transaction everyday it is already considered are global currency.