I see this in two different ways.

I see the bad side.

But I also see a good side. It could make people more liking to the mixes and create more of a demand so ones in shelters are adopted. All dogs were created from mixes. There just didn't appear, say, 2 Border Collies one day. It was created from something else.

I don't see anything directly wrong with creating (Labradoodles).