because bitcoin system was so protective and people in all country starting investment everyday, it makes bitcoin can survive from extinct
Bitcoin can't replacement currency but the technology can ( blockchain ). Currency is legal financial instrumentand every country will protect it from any product that can give negative impact into it. But blockchain technology can use to support financial activity, more fast, secure and transparent. Bitcoin is more like commodities ( gold ), see the pattern, product history and value you'll see there's no different there.