In many cases the forest was over grown to begin with. No harm no foul. Need for 85' Christmas trees is pretty low.
Christmas trees for the masses are farm grown domestically and imported, just like corn and fruit.
Slightly off topic - Our govt management of the forest resources for the last century has been criminal in my opinion. My family was in the timber industry for many years, we harvested and sawed during the 60's, 70's and 80's. Between early environmentalists and politics, one of our renewable resources has been squandered and and put behind 50-80 yrs.