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?
Every country has its own financial institution and different levels in that. Removing these flaws by bringing a common mechanism would be the major problem. Bringing one global currency in to scene, will increase debt on countries having low value currency. For example - Indian Rupee is downgraded compare to dollar and hence such conversion may lead to increase debt level over our country. The bigger a system gets,the more it become prone to faults. Distribution of powers among developed and developing countries would be another major problem.
I think it is impossible.