Well, I can certainly give you my opinion on that, but I want to mention that in most states it is illegal to release birds in the wild without proper authority to do so. So please, before saying anything or doing such things, verify your local laws.
In PA, under our PA Game Commission permit, we are authorized to raise, breed and sell (or give away) our wild species in captivity (which also has rules).
Now as for releasing quail, I personally would love to see more in the wilderness as well. Have never seen one in my life until I hatched some of my own. It is a sad thing brought on by many conditions of nature and humans. Mostly, restricted game hunting and protecting birds of prey have reduced wild quail populations to almost nonexistent. While those restrictions are necessary for those species of animals, it doesn't help others. For that reason, I don't think releasing them will help much. Typically people hold them too long before release (thinking they have to be grown up to make it), when the reality is it makes them dumber and easy prey. They also lose their ability in many cases to strengthen flight abilities and learn their habitat. Which brings me to the next issue, there is relatively less and less optimal habitat for wild quail due to overbuilding by people and overgrazing of other animals. We could go on and on about the many reasons you shouldn't release them, but people will still do it. Some may make it, others won't. I guess that's the fact of life in most cases in the wild. Altho their chances are greatly reduced by us, lack of wild instincts and predators. And I didn't even touch on the potential of introducing new disease to the original wild populations or interbreeding nonwild species.
There is a lot to consider in making a decision like this. The primary one of legal concern and then what is in the best interest of the species.
Jody