Other breeds have been destroyed because the customers demanded a product that had nothing to do with work. They wanted pets, not working dogs. To the extent that there is still a market for working dogs, there are some really great lines of German Shepherds and Malinois that sell for lots of money because the market demands it. The business incentivizes that breeders of those working dogs produce the best quality they can because they compete with each other to gain customers like police and military. Yes, GSDs have non-working kennels that breed crap. So do pit bulls. They cater to a different customer. But as long as there is a demand for working bulldogs, there will be breeders that attempt to supply them. It's a good thing.

Business has only helped Thoroughbreds. It's helped basketball players improve. It's helped every sport and type of athlete to up their game, figure out better fitness programs and better training programs to improve the final product: performance. It can do the same for bulldogs.