Lots of factors have all come together at same time to decrease the numbers in my opinion. I hunted two areas in Alabama this year 30 miles apart. One area has an increasing population, the other decreasing. The birds for the most part gobbled good on the increasing area and horrible on the decreasing (turkeys were killed on the decreasing tho as still has a somewhat huntable population). Corn has increased the predator population, especially coons, and before ya'll say it, the use of corn was not as prevalent, before baiting was allowed, as it is now. TSS has certainly killed field birds that would not have died. Decoys have let people that otherwise had little chance at killing a turkey kill them on a regular basis. Increase in hunters? , possibly. Loss of agriculture, for sure has hurt. Loss of habitat, yes, 110%. Hogs, yes. The odd thing to me on my areas I can hunt is the place with the decreasing population has much better habitat.