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A simple answer is yes. When you mix breeds without purpose, you are destroying the original breeds used to create it. If you are going to outcross for new blood in a line, you must know the history of the breed and what traits to look for in outside breeds before you chose one to make the cross. Then you spend a few years breeding back to the breed standard.
Also, people lose interest in the breed they chose for various reasons:
Does not produce (meat or eggs) like they thought
Doesn't mature fast enough
Too aggressive
Too flighty
Market saturation (i.e. they can't make any $$)
A lot of this can be avoided if folks would actually read up on poultry and the various breeds before they make their purposes. Decide if they want cute pets, egg layers, meat birds, exhibition birds, etc... and make their choices accordingly. There is a ton of material out there on poultry and a good portion of it is available online via search engines.
Nearly a decade ago there were more Russian Orloffs than you could shake a stick at. Now it's nearly impossible to find a breeder, without having to go to a hatchery, for stock. I have contacted a lot of folks who kept a flock for about a year, maybe two, and then got rid of them because the birds did not lay well that second year. It's just sad.
Then there are other reasons:
Forced to sell out/reduce stock
Predation
Breeder passed away without leaving their legacy in the proper hands