If that were true you wouldn't be such a judgey mc judgerson and you wouldn't say;All I am trying to demonstrate is the difficulty of supplying the average meat eater their protein solely from chickens.
I stand by the statement that by keeping back yard chickens one is not going to make a dent in the commercial chicken production so if that is your goal then I have produced some numbers to support my point.
Argue with the numbers
Why on EARTH would anyone argue with numbers that are patently false? Debate me using literal fake numbers I pulled out of thin air. What?
The truth is a dozen chickens could easily provide a household of four with a massive quantity of eggs and meat if you hatched out the eggs not using a broody. If the average american eats 25 chickens a year, even assuming a heritage breed at half the size, that's 50 birds a year? If only half hatch that's 100 eggs. A single hen had BETTER be giving me 100 eggs a year. 200 is more likely. So a single trio, hatching chicks in an incubator produces enough meat for a household of 4. A small flock of hens SUPER easily meets a family's egg needs for a year too.
And again, "impact" is pretty loosely defined by you. You better believe that if every family bought even 2-3 less chickens a year from major companies it would make an impact. They would notice a 10% drop in sales. In fact they HAVE noticed drops in sales to small holdings. Which is why even large companies like Tyson are trying to move to more sustainable practices. More people are ordering free range turkeys for thanksgiving than ever before, organic sales are spiking and nearly every grocery store in the country carries free range eggs. That didn't happen because companies grew a conscious and thought 'Weeeell maybe we shouldn't be killing bees and should let our animals move." That happened because they were losing a tiny percentage of sales to small growers with a higher quality product and wanted it BACK. Who was taking those profits away? Small holders and local small farms and homesteads. Who was encouraging the desire for those products? Not Tyson or Pilgrims Pride, that's for sure...
For example! https://en.wikipedia.org/wiki/Free_range#Chicken_Meat
"In Australia, free range and organic chicken accounts for about 16.6% of value in the poultry market. This percentage is expected to grow to up to 25% in the next 5 years." and "In Australia... free-range eggs accounted for 44% of value" of all eggs produced. "Increased demand for free range eggs due to customer concerns over animal welfare has led to a number of different standards developing in relation to three core welfare measures - indoor stocking density, outdoor stocking density, and beak trimming. " In the USA? "In 2018, nearly 18% of all (egg) hens were in cage-free production, up from 12% in 2016 and 4% in 2010. According to USDA’s Agricultural Marketing Service, approximately 71% of U.S. hens must be in cage-free production by 2026 to meet projected demand."
A quarter of all meat chickens and half of all egg hens being free range in a whole country is a big deal. I would call that making an impact. A 450% increase in the number of eggs being sold being free range in the USA? I'm not sure what YOU think making an impact is.... But I'll take it.

Additionally, you don't get to a whole country switching to smaller scale or better food choices without having those choices available. To do that people have to be raising birds under those conditions. People have to be doing that work. And it's a growing movement so... Yes, I do think it makes a difference and it's a real possibility for a small scale producer to feed a lot of people and for it to add up.
Not to even begin to mention that qualitative value is real even if you chose to ignore it.
You didn't mention economics and money previously, if you wanna argue money making that's another post and moves the goal posts. I wouldn't even try to debate you, making money's not my goal. But even then, bigger companies making more responsible choices are still making money from it. It's still economically feasible and it's built on the backbone of smaller holdings.
In some weird exclusively-chicken-eating, no-incubators, unchanging-companies, specifically crafted so you can complain about people fantasy land you're right no impact happens. In reality, you're just literally wrong. And the numbers - the REAL numbers, not made up ones - show it.