Bitcoin must be a currency, we should all learn to believe in. Bitcoin gives freedom, and you wont have to worry about anything, every transaction is made with very less fees, and also very fast. When we have these type of many advantages, we must believe in bitcoin always.
It is already a currency so you don't have to make some magic spells for making bitcoin as a currency. And I like the things you have all said with bitcoin and all of that are true, that is why I keep on believing in bitcoin because of its decentralization it is not going to die as long as we are here the users of bitcoin.
I think he mean centralized currency because bitcoin is decentralize currency which is we can used only in online transaction and he want bitcoin would be like fiat that we can spend in small stores directly with physical coin/paper money.