Wow, I could likely launch into a diatribe that would bore every reader here to tears concerning this seemingly innocent queery. (Dont worry Ill refrain)
In my opinion the single biggest threat to our hunting heritage is detatchment. Dont get me wrong its like saying the reason the bucket is wet inside is because of a drop of water. However true it may be, that single drop of water is joined by countless other drops to cause the bucket to be fully wet. There are indeed countless causes attributing the decline in the hunter numbers and hunting's popularity but simply put as a society we have become detatched from the lifestyle that promoted outdoor sports in general.
I bow my head and raise my hands that I have been lucky enough to have been raised in a family that knew where its meat, eggs and produce came from (you might guess that wasnt the mega-super-giganto-mart). We planted and harvested, we hatched, raised and butchered, we birthed, fed and slaughtered or milked, we collected eggs, we hunted and we fished. There was no shame in what we did, everyone did it where I grew up. No remorse for the rooster who was raised to be butchered, no guilt for the butcher. Hunting served a purpose there was no shame in setting out for a day afield, no malicious intent on the part of the hunter. Contrary to what some may think the farmer does not hate the rooster, the hunter does not loathe the hunted.
Today.....
As far as the majority of society is concerned drumsticks come from a drumstick bush, hand picked at the peak of ripeness when the celophane stretches tight over the pink styrofoam tray. Those wonderful steaks pumped out of a Steak-O-Rator 9000 high speed, high volume, fully automated, production quality machine nestled in a pristine valley bathed in constant sunshine and gentle breezes. Honestly people cant even relate to their daily meals how can you expect the same people to understand the primal nature of hunting. They dont understand animals or farming and they certianly have no connection to nature. They have in fact become "detatched" from the lifestyle and from the land.
For better or worse hunters and hunting have been driven to the point of being little more than a niche group participating in a niche activity. I wont point fingers at conservation groups or televised hunting or leases..... (insert typical divisional rhetoric here) all of them are simply attempts by, for the most part, good people to preserve their hunting heritage. Even if some are misguided at times.
I would like to, at the risk or launching into the afore mentioned diatribe, point out that the second biggest threat to our hunting heritage in my opinion is division. I may not always agree with the way other people hunt but so long as it is within the confines of the law I will support their right to do so. I may not choose to hunt with them or around them but I support their choice to hunt they way they do. I refuse to be divided from my fellow hunters, trappers, fishermen and outdoorsmen. What they loose is what we loose. I will not stand against them even if they stand against me in some misguided attempt to better their own position. Next time you pass a "Wheelie Guy" or a "Gun Hunter" do not turn your nose up at them, tip you hat instead and bid them good hunting. Who knows the trend could catch on.
Well thats probably my $.02 and some change to boot.