My issue with The Kindle and Nook

Thanks to our amazing technology in this country we have created devices that you can use to download digital copies of books without having to search far and wide for the actual copy. While this is a huge conveinence to many people, I have noticed that the Kindle and Nook can be detrimental to our future. Due to our technological boom I predict and I hope it doesnt come true, that books will be obsolete in the next generation. Now say 30 years from now, there are hardly any books left in the world, only kindle and nook, and other knockoffs where you can download digital books, well who's to say that in 30 years those devices wont have a chip or program in them that censors books or dissenting parts of books? If there are little to no books left in the future then in theory the makers of Kindle and Nook could alter or censor books that are downloadable, and since there will be no print books, nobody will be able to check to make sure that what is on screen is what is in the book, so nobody would be able to check to disprove censorship.