CC's often times offer upwards of 1.5% cash back to the consumer as a reward for using the card. BTC on the other hands costs money to purchase (.5-1%). Why would the consumer buy BTC to pay for something when he could just use his CC and make money?
I have a feeling that these big merchants adopting BTC as a payment platform are going to be largely disappointed by the lack of people who use it.
I don't see BTC becoming a mainstream ecommerce tool unless it rewards customers for using it OR those merchants stop accepting CC payments.
Would love to hear anyone's comment on this issue.