In North America the "labra doodles" and "golden doodles" you see are mostly the product of BYB's and people looking to make a buck off of a "designer" breed.

However in Australia they are breeding these mixes with a goal in mind. The goal is to produce a sturdy non-shedding guide dog. They are using genetically tested parents and are breeding towards a standard. This I don't mind so much as they are trying to fill a need.

That being said though, I don't think there is really any reasonfor a "new" breed that cannot be fulfilled by an already existing breed.