This is what I have against that list. First, a breed has to be on that list to be counted. Then, the count has not been taken for many years. Add to that the way it is counted. An example is what was recently done with rabbits. NO breed club was contacted to see what members had or what numbers where being reported with in the clubs. A little note was put up on a few yahoo groups to make the count. These groups didn't have anything to do with the actual breeds being counted. There are 3 breeds that I know of that demanded an accurate re-count due to the fact that no club, nor the main registry (ARBA) was ever contacted. An example would be for the English angora. The post was made on rare breeds Yahoo group to ask who had English Angora. No post was made on any angora group, the angora club wasn't contacted and the sheer fact you have to use yahoo groups to be counted is crap in my opinion.. So.. if you want your rare breed to be counted it first must be on the list, it second must be turned in, in a count. Good luck with all that. When I contacted the person actually doing the counts they also told me that no actual count had been done in years and what was being done was by volunteers that really didn't have much of an idea about the breeds or where to gather info about numbers..
Add to this that this is the American count. A breed could be in mass numbers in other countries. This list is only for what is rare here in the US.
In short I don't have much faith in this count, the way it is counted or the way it is marketed to the public as breeds on the list are not always the ones that need attention. I could give many examples.
What I do see as important would be a count of American heritage breeds that do not exist anywhere else in the world that do need our attention. As they will not be saved by importation, or survive in other countries if they are allowed to fail here in the US. It is our own breeds that we need to worry about saving. Most of those are not even on the ARBC lists. I will add that most of the breeds they have on that list you can order in large numbers from most hatcheries.
This does not constitute rare or critical in my opinion.