Interesting idea!
I think that understanding value in terms of currency is much simpler than all of the complexities involved in understanding a language.
I moved from the US to France in my 20's. When I arrived there I spoke no French. I was indeed speaking and dreaming in French by six months. However, I was understanding relative prices, converting them to dollars, and assigning them their own values in Euros in under a week. I was also accurately understanding temperature in under a week (as evidenced by the fact that I could appropriately dress for the weather).
Cool thing to think about though. And I agree that when people start communicating value in terms of a new currency is a very important part in the currency's life.