Oh, maybe I got a little off-topic!
Anyway, yes, I agree with others....4-7 lbs has proven to be a healthy weight for these dogs, as long as they are well-bred.
Changing the breed standard wouldn't help a thing. The problem is all the unscrupulous breeders out there who are completely UNconcerned with health or the breed standard, and are focusing only one thing....the tiny size that will get them the big bucks.