there are numerous breeds around that have split into clearly and obviously different sub-species of each other. i can take a complete newb that has never owned a dog and with 5 minutes tutorial i can flash images of different lines of the same breed to them and they can correctly identify the differences wheteher they are kelpie, BC, various bulldogs, all the herders......
so if they are so clear and obviously different in both phenotype and temperament why keep arguing over which is the more correct version and just officially make things easier for the dog buying public to get a good match for the next 10-15 years and just make an official split which is already there anyway unofficially.
i have seen show dogs end up in working homes only to be taken out and shot cos they were not worth feeding and working dogs in pet homes euthed or rehomed once the family realised the nightmare they were living and were scared of their own dog or worse, bad fits by newbs not knowing there was research even to be done and unscrupulous breeders selling puppies. the newbs think that buying a purebred means it will act like it says in the standard not knowing how the dog will act and respond to training is determined by the line, the mating combination and a particular pup in a litter - what is written in the standard is as useful in real terms as an ash-tray on a motor-bike, experienced people know this but that doesn't help the well meaning newb looking for a companion for the next 10 years or so.
what could we lose, what could we gain?
keep in mind a breed is not recognised by science, there is no such thing, a breed is only recognised by a committee in a breed club and bought in and out of existence with the stroke of a pen. different countries and breed clubs even have different standards for the same breed.
is the breed concept in terms of purity any benefit at all, or should the focus just be on healthy, consistent/uniform dogs of a predictable temp/traits??
i think in the way old days dogs were not classified as breed at all, it was just types of dogs recognised by how they worked and less so on coat colour, size etc. seems to be a more logical system from which the "breeds" emerged from only fairly recently, but nobody can prove the different approach has actually improved anyhting. detailed pedigrees and matings have been recorded for a very long time for just about every type of farm animal to high levels of accuracy even if it was just hand-written in some farmers diary.