Serious, widespread genetic issues in specific breeds is a topic that I find heartbreaking, because I have ALWAYS wanted one of the "giant" breeds...until I started looking into their health issues. To spend thousands of dollars on a well bred puppy is one thing, but to do so knowing that I will most likely be looking at huge vet bills down the line, and a severely short lifespan is something else. (And often times pet insurance will NOT cover known genetic issues, so that isn't always a solution, either.)
I don't know why possible buyers don't consider breeds that are known for their longevity and lack of genetic problems. Is it because they're not "cute" enough? I KNOW cavs are so sweet, but so are many of the terrier and smaller spaniel breeds, for example, and many of them are VERY healthy. DM and I both had Wheatens back in the day, and they lived to be in their mid teens and had absolutely no health problems to speak of. And, yet, many of the terrier breeds are on the "watchlist" for having very low numbers.
Terri