How do you think a Lab was created? How do you think any type of dog was created? Through crossbreeding. Many of the popular purebred dogs are developing health problems from all the interbreeding among themselves. Most vets will tell you that a mixed breed is actually more likely to have less health problems than a purebred.
i personally, don't have a problem with well bred doodles. if this is becoming a stable, well defined breed then so be it. the problem arises when BYB's are looking to make a quick buck and will bree dhte 2 breeds in an effort to be able to sell these mutts at high prices. and at this stage of the "breed" they are just mutts. labs and poodles both began like this but they are now stable breeds, unlike doodles.
i personally also dont think we should stop mixing breeds. all 4 of our dogs are mixes and i love that they all have a variety of traits form the breeds that they are. buster and harry were both free. (buster from a car park and harry was given to us so that her husband wouldn't shoot him) and sophie was from a BYB (still, we decided on her even though we knew she would have a lot of health problems, she's a big white dog with bad back and bad hips) and mac from a pet shop (i know not the best place but i begged grace to check at shelters first and she said she didn't want and old dog, she wouldnt listen that they have puppies aswell)
and the labradoodle was first bred as a seeing eye dog for dog-allergic people. out of the litter of 5 pups that weer VERY CAREFULLY bred by the guide dog association, only 2 were even suitable to become guide dogs without shedding too much. to sell the remainuig 3 puppies, the breeder gave them a catchy name. rather too catchy as people that do not always undertsand how hard it is to care for a dog keep buying these, "designer breeds'' and THEN relise how much effort a dog is.
good luck with your dog though. this isn't a shot at you. its just my opinion on why so many people are against these designer dogs.