The moment all the countries convert to crytocurrency would be the beginning of many amazing things to happen to the world and the financial sector, the process sending and receiving funds worldwide would become very fast and easy, it would lead to growth of businesses and make life easier for citizens of the world.
that would be really amazing if could happen.but i think it just our imagination and could not happen in near future.moreover many government still confuse with bitcon regulation.
All the counties are accepting the Bitcoin but only disadvantages is decentralized platform. Most of the governments are discussing the Bitcoin legalisation but it is decentralized and transparent platform so government should not control the activities. Once legalised in Bitcoin many regulation is possible in all the countries. Bitcoin will be globalised cryptocurrency in future.