Turkeys are just easier to find now, not easier to kill.
When populations increase, you get a number of factors that work against you as well. More hens means more competition and more henned up gobblers. More turkeys means more sets of eyes and ears to defeat.
Missouri has always led the nation in turkey population. The turkeys there seem to be tougher for the reasons listed above. As Ozark pointed out, they also gobble very little after leaving the roost, they don't need to.
Michigan is just now reaching a third of the turkey population Missouri has. The birds here are a bit easier to call up and will gobble much later into the day.
"The joy of living is his, who has the heart to demand it." Teddy Roosevelt