I think there should be, similar to the "accept this answer" button, an option "none of the current answers are correct/acceptable/satisfying".
Currently you might ruin/lower your accept ratio by asking questions where you don't get a satisfying answer. Deleting those questions after some time is certainly a way to deal with that but I don't think users should be encouraged to delete questions because of this.
Without checking if the user is telling the truth or not, in Disable Chrome Developer Tools' $ function that was exactly the response to a "your accept rate sucks" comment.
To prevent people from abusing this feature to not accept any correct questions, this option should become active no earlier than one or two weeks after the last answer to thw question.