Almost as soon as e-books came on the scene, there have been talks of the demise of the book as we have long known it. These doomsday predictions are far from being true. While rapid technological reform (a more accurate term than 'progress' I think) has become the norm in today's world, it is far too soon to make such a forecast about books. E-books have been on the market in a significant way since just the mid-2000s; the codex has existed in virtually unchanged form for more than 1,500 years. In just that short time, we have already discovered that the amazing convenience and storage capacity of e-readers come with a price, with draconian (i.e. anti-sharing and ownership) DRM policies and rapid generational updates ensuring that e-readers function without some of the most useful features of the traditional codex.
While I am quick to refute those who claim the traditional book has run its course, I am often disappointed by the overly-sentimental apologias that are usually put forward by defenders of the traditional codex. The chorus of sappy humanists defending books on the basis of emotional significance and sensory experience (see here and here) does contain a few grains of truth, but books don't need such a subjective appeal in their defense. It makes for nice drama and all, but the traditional codex will not continue to endure because of its emotional power (or use as an ironic prop), but rather due to their remarkable technological persistence. The practical value of books lies in their function and design-not aesthetics.