I was sorry to hear of the many cozy series being dropped by the major NYC houses. The astounding part of it for me is that many series are still popular, but aren't making money for the house, so they're discontinued. Also, some of the authors won't be able to take the series elsewhere because the characters or series name/identity is owned by the publisher.
I will venture a guess as to why the industry decided to downsize them, though. I realized the other day that the last six or eight cozy mysteries I have read were VERY similar in setting/form/setup. The sleuth is a woman who runs a shop on the restored main street of a small town or resort town. (A pickling shop, a cupcake shop, a popcorn shop, a yarn shop, or whatever.) She is next door to other women who are running similar businesses. She lives above the shop or nearby. A murder takes place and she is a suspect or her best friend/neighbor is. The circle of people she interacts with is full of suspects. The shop is popular when she is not under suspicion (and the town must be full of extremely unhealthy people, for they come to the chocolate fudge shop or cupcake shop daily to fill up! I have never seen such successful small businesses! LOL) and business falls way off when she is under suspicion or suffers from rumors. The sleuth usually has an estranged hubby who would like to either get her back or sabotage her. She also has a boyfriend (sometimes two!) and probably a dog or cat who helps defend the turf. Often the detective is a love interest.
OK, I will admit that I read and enjoy them mostly BECAUSE of the mundane details. I wish I could find such a town free of economic or environmental issues in real life. The recipes, the talk of neighbors, the puzzle (not generally super-challenging, though), the lack of overt gore and extreme violence porn (most of the time), and so forth make the books a reliable bubblegum read. You usually don't have to worry about animals getting seriously hurt (although there have been exceptions) or descriptions of extreme torture porn or yuckiness (ditto). You can usually relate to the protagonist, who is "determined to make it on her own without help from the ex and despite the town turning against her."
Those old ropes do fray, however. The problem is that there's so little originality and so much similarity. You could just about exchange one book in a series for another book in a different series and track right along. It stretches credulity that the shops could all be viable in a small town--because many stores are having to go out of business in real life, and this just isn't realistic. The authors are not stretching themselves creatively and the reader is getting into a rut. I'm pretty sure that this is another reason that the genre is being downsized. We need some new tropes and different plotlines. (Yes, the caterer's food was poisoned by a baddie who wanted her put out of business as a nice side effect. Many, many times. How about something new? True, there is nothing new under the sun. That IS a difficulty.)
Sorry to sound so harsh, but maybe the abandoned authors will now stretch and go to a more traditional mystery format. A traditional mystery that is not a cozy can be set elsewhere and might have different tropes. My own MURDER BY THE MARFA LIGHTS is a paranormal without being a zombie/vampire/witch/werewolf deal, and NICE WORK explores the seamy underside of the BDSM lifestyle (and the minds of unscrupulous people.) Different, but still mysteries with the normal mystery feel. (Who did it? Why? Justice must be done. Goodness must prevail. Love conquers all.)
Who knows--the new books could even revitalize the field. After all, we do not want another "Twilight" fad with werewolves VS zombies or something to overtake the industry . . . aack! ;) Let's see if we can turn this to our benefit. Not to say that I never want to read another cozy-knitting shop-cozy again, but perhaps it IS time for the next fad to take hold. (Just hope it isn't more zombies.)