Pa I hunted all around Grand Junction Tennessee when we had wild quail with some of the finest dogs in the land.....quail hunting without a dog is stupid at best. 
jOe....I guess if you hunt in the dense leafy woody woods of humidville America, then you need the help......F.Y.I., as an example, about 85% + of Arizona/Southern Utah Gambel's quail hunters do NOT use dogs..............
in fact, read some of Jack O'Conner's old quail stories from AZ or Mexico and look for a dog anywhere in his many quail stories, and you will see this is nothing new...............I know you've never experienced this or seen it or understand it, but it's always been that way in the Southwest........if you walked the land, understood the birds habits and manuevered around the Cholla jumping cactus you would know why...........this is why "we still have" wild native quail........
Since quail nest on the ground, Roadrunners eat their fair share of quail eggs in the Southwest during nesting, as do some other pests.......
I lived in Southern Arizona for over 25 years and there was no whistle blowing going on during either of the two quail seasons......FYI.....some of the open grass valleys around Patagonia along the border with Mexico accomodates dogs o.k., but the native desert country is NOT dog friendly............
this is not Tennesse, Georgia or Kansas....