Agree with you, niche is to be found. That is the best option to go. Since crbit hasnt had crowdfunding or any other funding projects i bet they have very limited advertising founds. So they cant count on getting a certain % of people thru advertising campaings.
I thing they should look into sectors that have hard time getting credit card payments like online casinos, replica stores, etc. This kind of buissineses make huge reveneus and would be glad to have stable payment solution.
What has to be done is to make people ( buyers on this sort of websites) easily accses crbit coin, meaning that they only register on some website which would than store crbit for them and allow them to buy them directly with ther credit card on the same website. In a way similiar as to what paypal does.