There is no good explanation for your question, simply cause bitcoin can not be used for paying many things in real life. On other hand with bitcoin is much easier to work online, send and receive money, pay for something, or be paid for some work.
   This struggle between currencies will always be around us, bitcoin is something new and many old conservative people will not accept all this. New generations are coming, bitcoin need to survive and maybe for 20, 30 years can stand against fiat.