Some online shop already accept bitcoin as payment, they are now accepting. Well, in the next generation so I think bitcoin will become one of the currency soon.
I can say that with the increasing usage of bitcoin for online shopping and trading can increase the interest of the people in bitcoin, in fact it is more easy than fiat currency to use bitcoin for shopping online and for so many other purposes. In modern time it is expected that the new generation will even give more preference to online currency as compare to fiat currency therefore the demand and interest of the people will continue increasing in bitcoin for a long long time.