The reason that Earl Kress (animation historian, H-B employee and H-B DVD producer) gave for the remaining episodes not to be released was because of music rights issues, like Quick Draw McGraw. According to Earl, Warner Brothers bit the bullet and paid the high music licensing fees for the Huck and Yogi sets but then when sales were "disappointing", WHV was not willing to put up the money to release any more. Warner Archive has hinted at the same thing over the years; as well as that if they were to release the remaining episodes of THE HUCKLEBERRY HOUND SHOW that they want to present it as it originally aired. I think that these Huck, Yogi, Quick Draw, etc. cartoons are like Looney Tunes at this point: they have remastered all that they are going to remaster and that is it for the old vintage cartoons. I hope they prove me wrong.