That does NOT necessarily mean the adoption of BTC... Amazon is so huge that they would creatively be able to manipulate some kind of centralized Amazon coin while attempting to appear to be equivalent and/or superior to BTC... NO?
They can try. It might not even be completely unsuccessful. Centralized currencies have several barriers that are hard to surmount however. How many will be willing to buy into a currency from a company that is effectively in thrall to the US govt?