I think that you are not seeing the bigger picture here. You think that bitcoin is popular just because you are in this forum. This is what you see and maybe your friends are also using bitcoin. But at the end of the day, there are millions of Amazon users, eBay users, and all the other famous online shopping sites out there and they all use Paypal. Paypal is still the leading payment method and people have already become confident using it. Bitcoin is a little too advanced for the mainstream people today.