Although as an ex gamekeeper I am opposed to restrictive legislation I can see how big commercial game shoots have vastly increased the number of game birds released in the last few years. Driven Pheasant shooting on some of these big commercial shoots is little different from a Clay shoot, the only real difference is you might get your boots muddy.
When 600 or more birds are shot in a day on one shoot and not harvested for food it's hard to put up an argument for it to continue, Example: where I live I flush Pheasant and Partridge everytime I walk outside my door, that is not normal.
When I was a gamekeeper I was proud that I did a lot conservation work for native flora and fauna as well as rearing Pheasant, Partridge and Mallard, I kept down predators and didn't need to swamp the countryside with thousands and thousands of non native game species to provide decent sport for men with a interest and love of the countryside and not just city slickers with too much money.
I suppose that too much of a good thing is always likely to turn bad, that is how I see this turning out.