Bitcoin could be as payment only if some country have regulation and legal for using bitcoin as payment transaction, but right now too hard for getting bitcoin as payment and legal transaction.
I think bitcoin has been used as a payment tool on the internet since the price was there. well, but to be used directly, it is still difficult to obtain because it is contrary to government regulations regarding fiat. it may be true, that bitcoin can be used as a payment tool when the government issues regulations for this