Every time a BYB is criticised for producing yet more pups, up pops another apologist who trots out the tired old lines about how difficult it is to find a rescue who will home a dog to people who work or have children. 
Yet, mysteriously, all the rescues I know, volunteer for and am involved with :-
Will rehome to working people (provided it's an adult dog not a pup and there are appropriate arrangements in place for walking/exercise)
Take a sensible case by case approach to adoption with young children (under 5s) - usually it's dependent on the individual dog.
I'm in S Wales and the following rescues based here are included - Greyhound Rescue Wales, Greyhound Welfare, Animal Lifeline Wales, Hope Rescue, Four Paws Rescue, Lizzies Barn Rescue, Croft Rescue, and Dogs Trust. Between them, these rescues rehome hundreds of beautiful dogs every year to loving responsible homes where there are working adults and children.
I know a fellow MNetter who is having a homecheck on Saturday - she has both children (3 lovely boys) and a job. Oddly enough, she's had no problem at all in sourcing a gorgeous young whippet bitch, mainly because she got off her arse and phoned around a few rescues.
I'm closely involved in efforts in Wales to improve dog breeding regulation. New regs are finally being introduced this May after 2 rounds of consultation and endless hard work in lobbying and campaigning. Rescues have been in the forefront of this campaign and it is the so called "hobby breeders" and the KC
who have fought the proposals every step of the way and done their utmost to water down the very modest improvements being suggested. So forgive me if I am a little cynical about aspirant BYBs.