I think what they are trying to say is that you can have your prices in usd and then just convert it for every transaction.
Not that it would make sense to integrate anyways, people are clinging to their BTC now and when it comes down you won't have anyone to sell it to if you are a vendor.
I see what they're saying, but even if my prices are in USD on my site and the number of bitcoins for the transaction doesn't matter (which it does, but we'll continue), you can get still get really easily fucked here.
Imagine this scenario:
My product costs $10 USD, which is what is shown on my site. Someone pays me the equivalent price in Bitcoins at 9AM today. Tomorrow morning, I wake up to find that Bitcoin value has dropped by 50%.
I am now 50% poorer unless I immediately cashed out that Bitcoin to USD upon receiving that purchase. My margins just got fucked, my revenue just got fucked, I just got fucked.
Why, as a merchant, would I take that risk? If I have to constantly immediately cash out my coins, the coins are no different than arcade tokens.
What's happening here is that the only people really doing anything with Bitcoins right now are speculators riding a money train. Merchants aren't speculators, there's enough volatility when trying to sell a product, I don't want to be worrying that the money someone is paying me with can implode overnight.