It may not pass traditional methods of payment but it doesnt need to. It can be a valid method of payment along with cash, credit cards, PayPal, etc. and still be successful.
Yes, it may not surpass but it can compete with the current payment methods. And actually, it is already being utilized already. There are known merchants that already integrated bitcoin as means of payment method. Like in my country, I didn't know that Grab is already accepting bitcoin to top up your account. So I guess that's one good example that bitcoin adoption is going mainstream.