IMO the answer to both is yes.
In my area there was some legislation put in place that basically required the veterinarian to inform the cities if an unlicensed dog were given any vaccinations. It's their way of ensuring dogs are licensed (as they should be) and that no one was violating the codes and having too many pets.
Many people have simply decided that they won't take their dogs to the vets for proper care anymore because they don't want the City telling them what to do.
I know of too many people who refuse to believe in the health benefits of sterilization and who refuse to have their animals sterilized. Several people have told me of "friends" who decided their two dogs were perfect so they "bred" them...
This will work with the lay people.
But vaccinations are easily and legally purchased on the internet.
It would be quite easy for those that wanted to continue to indiscriminately breeding animals to just purchase and administer their own vaccinations to keep them away from vets.
In fact, many people already do.
This thread really is amusing.
Right now, the biggest abusers of dog breeding are the puppy mills.
And the puppy mills are the ones that the government issues licenses for. There are already laws on the books that require a license if you have x amount of breeding animals. These are the facilities that are regulated by the very laws everybody here is clamoring for. And we can see how well the regulations are being enforced.
In fact, if you ever see a breeder touting their "license", run for the hills because they are most likely a high volume, puppy spewing facility.
And you want more regulations?
It is the show and reputable breeders that are working rescue, that are being responsible. And the good people that love animals of course.
For the reputable breeders, over population is the first and foremost on their minds.