It seems to me that you need to evaluate the goods exclusively in bitcoins, without relying on the dollar. Otherwise, you will still depend on fiat.
Here's a comment from another post regarding that:
I don't think we ever go from using a fiat metric (e.g., USD) as the unit of account to going to using BTC as the unit of account.
I think the price for a good or service will involve a calculation using the underlying data sources in real-time (or close to it). These data sources could include commodity prices, labor costs, property costs, and capital (interest rate) costs, etc. Then once that calculation provides a result, then that is what then gets spit out as the "price" ... in BTC, or in USD, or in EUR -- in whatever medium of exchange the buyer wants prices presented in.