Perhaps I wasn't clear enough before. I'm not expecting advertisers to respect the wishes of individuals. I am suggesting that there should be some form of user

Perhaps I wasn't clear enough before. I'm not expecting advertisers to respect the wishes of individuals. I am suggesting that there should be some form of user control over video auto-plays. The question is what form this user control should take. For example, perhaps whitelists for domains that are permitted to have audio content could be a good solution. These whitelists could be controlled by the user. You would then only opt-in to sites that had content you wanted to listen to.