Yes, the built-in deflation seems to be Bitcoin's biggest question mark. Other the hand, Bitcoin doesn't have to replace the complete currency system to become

Yes, the built-in deflation seems to be Bitcoin's biggest question mark. Other the hand, Bitcoin doesn't have to replace the complete currency system to become a useful medium for transactions. So, a low-level of inflation can still be maintained via fiat currency. (We obviously need a certain amount of inflation to encourage people to invest vs. hoarding their money.)