A lack of knowledge about even the existence of Bitcoin keeps a majority of consumers away. For the rest of us - there are some who know but don't bother simply because it's more effort to buy Bitcoins and then spend them than just use your credit card to buy whatever you want to buy.
That was the one of the main reason , they don't have enough knowledge about bitcoin and they don't even know what is it . Some people stopped to use it and the other didn't want to use it ever because of losing their interests from investimg on bitcoin people don't want to buy bitcoin or they don't know how to get a decent earning .