There is no trend towards downsizing at the shows - dogs are required to be in the standard -
"23-24 inches at the shoulder for dogs, 21.5 - 22.5 inches at the shoulder for bitches. Animals up to one inch above or below the standard shouldbe proportionately penalized. Deviation in height of more than one inch from the stand shall be disqualified."
What we see is that so many people, for a lot of years, have decided that "bigger is better", and then "smaller is better". So, we hear all the time at shows spectators asking "What kind of dog IS that?" We say "A Golden Retriever", all the time thinking that they must be from another planet if they do no know what breed it is. They then reply "Well, MY (neighbor/cousin/co-worker etc) has a Golden Retriever and HE is 30 inches tall and weighs 110 pounds (or substitute 18 inches tall and 40 pounds...). Are yours the Apartment Sized Goldens (or, substitute Blocky Goldens)?" And we reply, while trying not to repeatedly bang our heads against a pole "No. This is correct. There is a standard for every breed that they should conform to, which included size. They are written so that dogs will be made correctly in order to properly perform the tasks that they were bred to do. If they are too big, or too small, or their muzzle is not broad enough (etc etc for whatever breed you are being asked about) then they cannot perform those tasks efficiently." About this time, the spectator's eyes glaze over and they ask "Do you know where they are showing the (Puggles, ShitPoos, Pekaboos, Labradoodles, DandiDoos, Chiweiners, Schnoxies, Gollies, and Dalmadors)?
So, I guess I would say, that although I love all dogs, if I am going to have a purebred of any breed, I want it to conform to the standard by which it was bred for.