I was tempted to say "No way!" but then I remembered the saying "Never say never." While it is impossible to imagine anything treating today's Amazon dominance, we should also know that many empires in history have fallen at the height of their power.
I would be very happy if OpenBazaar grabbed at least a tiny portion of Amazon's share, for starters. Because a decentralized marketplace like this would be a blessing for both sellers and buyers. Amazon's current monopoly is hurting both of them.
Maybe Amazon will switch to using crypto one day, or maybe they are not really interested. It doesn't matter much. Nothing last forever, and in the new crypto economy of the future there is certainly a lot of room for projects such as OpenBazaar.