in my opinion it's a good step taken and chosen by Amazon because maybe Amzon has realized that bitcoin will become very expensive in the future so that Amazon keeps and accepts bitcoin as much as they can by utilizing bitcoin payments they will be able to get bitcoin with a very large amount and it is also their strategy to attract increasingly high demand because there will definitely be lots of people shopping using bitcoin payments.
That's true, if this happens to amazon that accepts bitcoin as a payment system then the positive impact of bitcoin will be visited by many new users. However, OP has another view if this has happened, all we know the process of bitcoin transactions is still slow, only a few transactions can be processed within one second so as if everyone uses bitcoin then there will be many transactions that are pending. Maybe it will be a solution if the lightening network can be functioned immediately so that every transaction can be passed quickly.