The article misses out completely on a couple of the more influential factors.
Age is probably the biggest, the baby boomer generation are shuffling along towards the end of their earthly sojourn and dropping out of active participation as age, infirmity and loss of lifelong shooting and fishing partners all take a toll.
The US has done a bit of research, most shooters and fishermen give up in their early 70’s for any or all of the above reasons.
Shooting is expensive, you need both disposable income and your own transport, for most young people nowadays that’s just a pipe dream, as is owning their own home.
Access to live game and land is difficult and it’s not being made any easier by changing societal attitudes towards all shooting and private gun ownership. Huge swaths of land are now controlled by corporations companies and organisations, that as a matter of policy, are utterly opposed to “ sport “ shooting of any kind.
30 years ago this attitude was rare, now it’s everywhere and it’s having a big impact.
We, that’s us, this generation, and our supporting bodies have permitted firearms possession to become a privilege.
The police have adopted policies with a strong bias towards refusal to grant or revocation.
Refusals and revocations generally go unchallenged.
Then theres the product itself, game.
It just doesn’t suit modern tastes, the quality and taste is hugely variable, it’s awkward to prepare, it can have a very strong flavour and sometimes comes with tooth marks and lead shot included for no extra cost.
Sing me no songs extolling the culinary excellence of the various creatures adorning our plates, I’ve tried most of them, even curlew ( tough, fishy and inedible, rather like osprey if you’re wondering) and you can keep most of them.
I like partridge, woodcock and snipe. I’m not over gone on pheasant or wild duck, especially ducks off the foreshore.
I don’t really care for hare or rabbits, except maybe for a couple of 3/4 grown grazers sniped in the local fields a couple of times a year. You can keep wood-pigeons unless they’re on grain. Brassica's, clover and ivy berries make them lean and bitter, old age makes them tough.
Venison, a young hind cleanly shot and well looked after ranks with pure manna from heaven. A stag in rut will stink the whole kitchen out and isn’t a culinary experience that most people would want to repeat.
If there is to be growth in the industry it’s going to come from the various target shooting disciplines. Target shooters are the only ones I can think of who will legitimately wear a gun out and they’re never satisfied with what they’ve got, ensuring a constant supply of decent secondhand kit for newbie’s.
Start with air guns and primary schools, since we’ve allowed access to even the humble .22 become difficult, air guns are accessible, cheap to run and can be used almost anywhere.