#1 influencer of decreased gobbling activity is hunting pressure.
I also think birds have different personalities, and the more vocal birds are killed early season, leaving the less vocal birds as the only ones left.
3 sits without a gobble isn't much to go on tho. I've hunted 22 or 23 days in MS since I've heard a gobble. And there are still birds here.
Last hunt of the season for me today. Still hoping one fires up. Gonna be a long 10.5 months till next spring.
Lots of folks have noticed decreased gobbling activity in TN as well. I spent 12 of the first 16 days of TNs season in the field. Roost gobbling activity was normal, but down 90% from years past once their feet touched the ground.