If Amazon is really going to do that, it'll be great, we can buy everything we need with our Bitcoin 
). After Amazon there will be a lot of other online market also accept Bitcoin for payment as well
Yes, we can but not in all countries anyway. There are still some countries where Amazon does not really ship to so we may just have to look at the concentration to be in some particular regions until then. However, it is still going to be massive anyway considering Amazon being an e-commerce giant with a lot of transactions being done every day. It would definitely pave way for a huge adoption for bitcoin.). After Amazon there will be a lot of other online market also accept Bitcoin for payment as wellAnywa for me big companies accepting bitcoin would render Bitcoin as popular as paypal in my opinion.
It really will push the adoption off the hook and knowing the amount of trading that is being done on the Amazon platform daily and looking at how the trading on Purse.io alone has been going for a while now, then one can really say the market is going to be huge. Bitcoin is surely not ready yet for that massive usage yet, but anything can change with the scaling issue being solved within a split of a second.