I think Amazon has accepted bitcoin as a payment method for a long time, and it seems that not many users have made payments using bitcoin, because many people are not familiar with it.
Well, I am not aware of it. I thought they are accepting digital currencies which are fiat based but not cryptocurrencies. But there is a huge tendency especially with what happened recently wherein it could be the start of global payments using this technology but it is not yet assured. It will depend on how will it benefit third party networks or the economy perhaps, in general. Familiarity is also a factor, so since influence is already there, I think it would be a good basis for other companies, on how will they respond to crypto adoption. So let us all wait.