they are already it's called purse.io and you get like 30% discount on your shopping list ;)
#roguemoney 's V talked about this like 6 months ago might have been even before that
global acceptance of cryptos at this stage knowing Amazon's risk profile and how that company ticks...doubt it. bezos is in the club as George Carlin used to say. that by default means he doesn't like Trump and hates Bitcoin :)