You continue to talk as if the day will (soon?) come when ALL books will be available in e-form. Consider this: a friend of mine who is a V-P at New York Public Library told me that Sony will not deal with the company that provides ebooks to NYPL, the result being that NYPL ebooks will not be available for the Sony reader. Such stories will be repeated over and over. Certain books will be readable only on particular devices, and certain books will not be available at all in e-form for copyright reasons. I don't see these problems being resolved anytime soon, and hence continue to be sceptical about the success of the Sony and other ereaders.
BTW, a lot of library material, especially old journals and newspapers, cannot be scanned owing to their awful condition, or can be scanned only at tremendous cost.