I am quite sure they wouldn't do that anytime soon. I think The Amazon company might consider investing in bitcoin but would never accept it as payment. Why? there would be too many complications in their transactions because of bitcoin's volatility. The prices would change on a daily basis and would simply be an added workload/process which will cost them more money. Oh yeah, imagine millions of refunds in bitcoin that they have to process considering the value might go up or down the next minute/day. I'm sure there will come a time for this idea when mass adoption happens, though.