Until Amazon.com goes chapter 11 for whatever reason and ends up closing, OR is swallowed by Sumitomo Electric Industrial Oil Marine Agriculture Insurance Co. which decides to turn the site into a boats brand.
OR until Amazon has an internal shake-up and decides to discontinue the service, or launch a "3.0" version giving current users a 90-day period to download all their old material... BUT you happen to be on Bermuda on vacation so you don't learn abotu that until you return home and it's too late and... POOOF!
FC