First off, this article by science fiction author Cory Doctorow
Now, I happen to disagree with that position because I don’t think that text-to-speech is a substitute for audiobooks for the majority of listeners, and because the value of text-to-speech is such that people will buy enough ebooks to offset any losses from substitution, and, most importantly, authors who oppose this feature look like grasping, greedy jerks and will alienate their readers.
Quite apart from the infringement of audiobook rights, there an accessibility issue. Plenty of readers who are partially sighted or have difficulty reading will benefit hugely from having the text spoken aloud. This technology has the potential to bring books to a wider market. Meanwhile, those with a vested interest are content to arse around like mid-1990s record company executives and the RIAA.