I saw another similar article this morning that had one interesting tidbit that related to a conversation I had with my wife last night. When I was growing up boneless, skinless chicken breasts weren't a thing at all until I was probably 13 or 14. If you wanted chicken you bought a whole chicken and I remember once a week we would have whole roast chicken for dinner. There was a stat in the article that in the 80s 50% of the chicken sold was whole chickens and today that is down to about 15% so Costco was having trouble getting enough whole chickens.
In the grilling/bbq communities I am in I totally see that playing out too. Most people love cooking a whole spatchcocked chicken but more and more people are cooking just wings or just thighs, or just legs.
And at $4.99 a chicken I am sure that puts a huge burden on the farms and factories that produce the chicken but for families buying the chicken they can get 2 or 3 meals out of that. Chicken one night and then pull off the rest of the meat for sandwiches, soup, pasta, etc. the next. And it is pretty dang tasty chicken.