So what I'm saying is that it would be impractical to have the price of things in the real world in bitcoins.
This is where we disagree.
I believe that is only the case
currently, but wouldn't necessarily have to be the case for an 'island' adopting BTC as it's official currency.
But that would only work for an island essentially isolated from the rest of the world, without any import or export of goods or services. The trend is that the economy in the world is becoming more and more global.