Or the alternative, where possible, will be to charge paying rifles (aka guests) what? If £60 for a four hour outing again it's not going to make economic sense to many estates. There's more money in using that stalker's time to look after pheasants. Deduct the stalker's wages and what's left? £10?
Unless there is an equivalent of the old guaranteed price such as with the Thatcher abolished Milk Marketing Board the game will almost become not worth the candle. That's to say the time, fuel, ammunition compared to the price per carcass.
And if the route if this option is too costly? Or it won't play well at all. The taxpayer paying landowners for venison whilst elsewhere folk are queuing at food banks. So the other road is what? Fine estates with a deer density above so many per hectare?
I can foresee an all efforts twelve or eighteen months mass killing to effectively rid an estate of a species that, once more for roe deer at least, have now become almost a "pest" species to be destroyed as merely vermin. This will not end well for the deer