lets remove this possibility entirely.
...by eradicating all the fiat.
So how will people be able to trade on the Nxt Asset Exchange if they don;t have Nxt.....and to obtain Nxt they would need to buy them with fiat thru the Nxt Asset Exchange itself....so there will be a point where Fiat/Nxt will have to be exchanged at particular points in the system.
or I think you mean that Nxt will be the only medium used on the Nxt Asset Exchange...NO FIAT pricing anywhere in the system.
you can enter the Nxt AEX and buy a house, car, alias or gold...whatever and pay in Nxt via this 24/7 Global decentralized marketplace.
You can always trade Nxt for goods and services without converting to fiat or other cryptocurrencies. Nxt's decentralized marketplace/auction will help facilitate this exchange. There will also be gateways operated by individuals that issue fiat or cryptocurrency IOUs and these can be traded in a decentralized manner.
isn;'t Fiat just an IOU