Can a deflational currency really be the preferred method for trade? Not only limited amount for a theoretically increasing demand, but existing amounts being l

Can a deflational currency really be the preferred method for trade? Not only limited amount for a theoretically increasing demand, but existing amounts being locked in inaccessible wallets. I have doubts. As long as bitcoin can't be a currency (and it certainly can't), it's fate is doomed. A more suited criptocurrency still yet to come.