There's been some controversy about this from shelters and rescue leagues. I have had firsthand experience from both. Cookie was from a local pound in Chicago. She had been left on the street to fend for herself after giving birth to puppies. Gigi was found through a local rescue league and was originally to be used for breeding but was given up due to the fact the family couldn't afford to keep her. Both types of groups have the most generous, compassionate, and dedicated people committed to making animals have a better life. The benefits from this historic moment greatly outweigh the disadvantages.
One benefit is that allergy sufferers who love dogs may have another option in being able to have a dog. Labradoodles, PWDogs, Poodles, Coton de Tulears, Bichon Frises, Soft-Coated Wheaten Terriers and possibly a few others will fit the bill. Another is events in the news such as this one will increase the amounts of visits to shelters, rescue groups and breeders. Since it's spring, there will be more people willing to take the time to train a new dog.