Its incredibly hard to convince anyone to use bitcoin, especially businesses. Fact is...they want reliability. Just discussing the fact the the market fluctuates daily is enough to make them ignore me. Ive tried talking many sites into doing it 
I'm running a small webstore and I will be adding BTC as a payment option since it is a) secure b) has huge Wow! factor. And I can easily adjust prices in real time, or maybe on a certain timeframe average. Need to model to find out which will be a better approach overall.
ergo - big players will not use it for a while, but that's OK with ME