I think they offer the heart of the sport. In quail hunting the dogs do the hunting and humans the shooting, so it would seem they offer everything that a hunt for wild birds would offer. Quail are fragile birds, even a heavy rain can harm the nesting chicks so any releif is probably a good thing all the way around.
I hope this thread doesn't go nuts like the lion threads. I've lived in elk country, the same one full of dangerous mtn. lions. First elk are a lot smarter than deer and I cannot remember in the 13 years I lived there hearing or reading of one being hit by a vehicle, I'm sure it's happened, but it can't be very common. I did have a herd run in front of me one time, but I would have had to be asleep to hit one. They will roam. I lived on the high desert and there were a few herds out there, but scattered. The one nearest me was about 5 miles away on a butte, yet on 3 occasions I saw them near or beyond my house, always young bulls and I suppose they were looking for love.
The bottom line is still, how do you introduce a free roaming animal and keep it confined short of a fence? Maybe the question is why would you try?