Well of course that's not the only issue, but it's a primary contributing factor.

Habitat degradation/minimization/fragmentation/elimination and commercial timber management are probably the major causes. Expansion of urban areas unnaturally inflates corvid and raptor populations. Instagram as a replacement for market hunting driving the glorification of a tailgate photo. All those hurt turkey populations. Bottomline, the more people you have doing those things, the more impacts you will see to the turkeys.