Why not? My wife and really enjoy Netflix. We can't always watch a particular program, but we can always find something worth watching.

In fact, sometimes it's the very fact that the show we were "looking for" isn't currently available that pushes us to try something new.

I would be absolutely livid if Amazon (and I) lost access to a book while I was in the middle of reading it. People just consume books and video content so differently, that I don't think makes sense for too many people.

Seems like they could just announce removals 30 days in advance which would give you plenty of time to finish a normal book. They could also stop new downloads of a book during this or a shorter period to prevent people from starting a book without time to finish it. To those that havent started the book, it would just appear that its already been removed from availability. Some kind of a warning of how much longer it will be available on the device would also be helpful as long as its not intrusive.

It's possible for publishers/amazon to build a contract that will protect you in that case while still letting authors drop books from the service.