ALL Bitcoin discussions and transactions revolves around its value in USD.
USD > Bitcoin > Product > Bitcoin > USD
which is the same as:
USD > Product > USD
First: So what?. if that is cheaper, faster and more secure: then Great !
Second: it's not true that all discussions are around USD.. You, forget that 3600 coins are mined each day, and miners use these to buy things in BTC (there are btc-only shops and website) or things in USD. Further: there are shops (Overstock.com for instance) who keep some BTC and don't convert them at all. Overstock even wants to use these BTC to buy the goods from its suppliers.
You may not be aware, but there is a BTC-only economy, slowly but surely, arising.

