[...] For a few years, around the time of the migration to the euro, I know I was doing the conversion back to what things cost in the "real money", which for me was the Irish punt. After a time I stopped doing the conversion as i got used to the fact of how much a pint of milk was in euros and the Euro became "real money" to me. I understood the "value" of what a euro was worth. How many M&M's I can buy in the shop, widgets, or whatever ... and I completely stopped thinking about things in Irish punts - it was effectively dead to me. The goal is to drive towards how we could do this for BTC's (assuming when you add up all the pros/cons it's better than Fiat) [...]
Right now the primary way of obtaining bitcoin is trading for fiat currency. The difference between your Euro example is at some point people started receiving their salaries in EUR, while this will not happen in the foreseeable future with BTC, even if adoption increases as those of us bullish on BTC think it will. Companies will start offering employees the option of being paid in BTC only after their revenues are coming in in BTC in meaningful numbers. BUT, and this is a very important point, the current size of the bitcoin economy cannot support a meaningful amount of purchasing power; $1.something billion with the majority of that being held does not go very many ways in a multi-trillion dollar economy; so in order for this reality to happen, the price of BTC would have to be exponentially higher than it is now.