I may seem crazy for saying this, but I don't see Amazon being able to drop either UPS or Fedex in the coming years. Their growth has been unreal, and to move all that volume requires an increasingly more complex supply chain which will require traditional carriers, contractors, and maybe some Uber like drivers who make a little extra money on the side delivering packages. When I moved into feeders in 2010 UPS was the sole carrier for Amazon, and while our volume has increased from Amazon significantly since then Amazon is using Fedex and the USPS more today than they were then too. I can't predict the future, but I can say that in my feeder department alone we have added 3 new drivers for every 1 retirement since I started driving over 6 years ago. We are putting on another 50 drivers this year. I don't believe we have much to worry about, even from Amazon.