Brewster Kahle, at The Internet Archive Blogs:

Ever try to read a physical book passed down in your family from 100 years ago? Probably worked well. Ever try reading an ebook you paid for 10 years ago? Probably a different experience. From the leasing business model of mega a publishers to physical device evolution to format obsolescence, digital books are fragile and threatened. […] Our paper books have lasted hundreds of years on our shelves and are still readable. Without active maintenance, we will be lucky if our digital books last a decade.

Full article here.