I have to say that my opinion on this subject is...
...breed standards change, there's always revisions to the standards. I am in favor of the new colors, perhaps not in the show ring, but at least being able to be listed as ''alternate'' colors. All the hype about different colors causing health problems, is pure doodoo in my opinion. That'd be like saying ...only black and tan dachshunds were healthy, chocolate and tan and red ones weren't. Unless somehow merle miraculously appears in the Yorkshire Terrier (which I would VEHEMENTLY be against...to be there's a difference in genes that have always been present in the Yorkie, rather than introduced....) then I know of no color or pattern that would cause health issues. I think people like me should attempt to eventually join the national breed club, so we can vote on color legislation!
Clips change, what's in vogue one year for a breed won't be in vogue the next year...I'm not saying to have an all silver, or all gold in the show ring...but a base color of chocolate, or parti-colored...I think they'd be stunning in the show ring. Why not allow three classes, like they do for cocker spaniels? ...Just my two cents.