I think the issue is that a lot of people spend far too much time watching the likes of wild boar fever on youtube before going on a trip and get the impression 'driven hunting' equates to the British notion of 'driven shooting' where by there is a high number of birds/boar and you'll have them dropping all around you...
the reality is somewhat different, especially if shooting unfenced wild forests. The skill level required is probably higher than a lot of people appreciate, as lets face it, we've all seen Prince Franz Albrect slotting 20 boar on one drive and making it look easy...... it isn't and in reality, it doesn't happen like that. And what they don't waste time filming are the other 3 days drives where he shot nothing at all.......!
As for numbers of boar/hunters etc, on some hunts I've been on there have been over 100 guns, but the area we were shooting is was plenty big enough to accommodate that number. As for numbers of game, well, its nice to see something on a drive, there's nothing more sole destroying that sitting in your stand for 3 hours freezing cold and seeing bugger all..... but that is hunting, how many times do you sit in a highseat at home and not see a deer.... it happens...
granted, its frustrating if the whole hunt is unsuccessful, and the overall bag is far smaller than anticipated, but lets face it, that's also frustrating fro the hunt organisers as they will have wanted/needed to get their bag shot ideally so you aren't the only one disappointed....
So I suspect for most people its misguided from the outset, if it was viewed like a stalking trip where the animals are wild and the chances are stacked in the animals favour I suspect more folks would be less disappointed with coming home empty handed. I just think expectations are set too high for wild hunting.