I think that now we've approached the 1950's, I think it'll be wise for Warner Archive to release the rest of them in a set or two. Considering the general consensus on these cartoons, I don't think that the sales on these 50's sets will be as high as they are now.
Though I am rather indifferent to many of the 1950's cartoons, I am kinda excited to see the public domain entries I saw on tape as a kid restored with the proper colors and better PQ.