If you wait until something is obsolete to remove it you waited to long.
Apple is a company that seems to take the leaps earlier than some on certain tech. They aren't going to wait around until no one is using a jack anymore and then remove it. They are going to do it and at this point they know that they will be helping push the market ahead. Headphone companies aren't going to want to miss out on sales to iPhone customers, they are going to be more motivated now to develop wireless or lightning enabled models.
Apple is a company that seems to take the leaps earlier than some on certain tech. They aren't going to wait around until no one is using a jack anymore and then remove it. They are going to do it and at this point they know that they will be helping push the market ahead. Headphone companies aren't going to want to miss out on sales to iPhone customers, they are going to be more motivated now to develop wireless or lightning enabled models.