I've seen loads of topics of people trying to sell things and saying I want x amount of dollars worth of BTC. Surely if someone is so keen on the idea of Bitcoin fiat shouldn't even be mentioned.
They should be prepared in certain instances to take a fiat loss for their beliefs.
bitcoin is a baby, and it is already killing the dollar.
give it at least 10 years, and things will most likely be priced in bitcoins directly, actually in 10 years it may be more accurate to say things will be priced in satoshis, since a bitcoin could probably buy a brand new car and maybe even a house.
The coolest part of all is that it will make making wars expensive, since bitcoiners do not have to pay the war tax by force unless if they voluntarily pay such tax.
To help the bitcoin economy we should buy in the following order:
1 max priority to vendors that accept bitcoins and keep the coins.
2. vendors that accept bitcoins and sell the coins for fiat.
3. fiat
4. credit cards.