My biggest concern with ebooks is what will happen to the concept of documented "truth" in historical records when any text can be invisibly tweaked at any time via long distance? A printed text, right or wrong, will not change on you, but electronic texts are fluid, especially in the way they are being distributed and managed.
Rekrab: Did you know it has been documented that oral cultures - cultures without any form of permanant writing - were much more stable and long lasting (you could also say stagnant) than cultures based on print. In oral cultures knowledge, or truth, as you call it, was transfered by word of mouth, from generation to genration. In stories, anecdotes, myths, fairy tales, songs, ballads, etc., you name it. Or as knowledge passed on directly from a craftsman to an apprentice. Now if some smartass wanted to change the "truth" by adding his own personal bit to it, most likely it wouldn't take hold because all the others passing it on would drown or filter out the smartass's new version.
Then, when print came along one guy could get his WORD distributed all over, giving the one smartass a huge amount of clout when it comes to changng "the truth". So I don't know. I think the fluidity of electronic texts might work towards tipping us back towards a more oral culture: the 99% smartass junk out there will melt away while the true stuff will stand the test of time.
And I think books will survive. (Just like LPs are surviving MP3s.) They'll just be reserved for the good stuff. I hope.
Makes me think of Ray Bradbury's book / movie Farenheit 451...