I only wish LP was rife in under 10 lb dogs, unfortunately most in the Toy group have a higher incidence of LP than ideal.
A standard Poodle Sized YT - God help me! With their temperament
But seriously, (I'd have to look up AKC again), but division of breeds by color, and by weight is not very easily approved (any-more) -- particularly color.
What if we are talking about Standard Changes I would love to see, is full health screenings by breed specificity prior to a CH being awarded You can earn all the points, but the final designation is not conferred unless the breed specific tests are done and posted on the agreed upon reputable health databases And that would create a tempest in a teapot!
I think rather than up the weight "standard" of upper limit of 7 lbs - is the encouragement of breeders to breed with in say a 4-8 lb range That being the bulk of their puppies adult weight is say low end 4 upper end 8lb Major faults for males less than 3.5 lbs or females for that matter. Faults for over 7 lbs but under 8 lbs.
Structure needs equal play and judgement to coat and especially to temperament. This in my mind is the Grand Triumvirate ...