the market is simply changing,.... magazines have to cater to what sells for their security. advertising ARFs and drones is where the money and the interest lies these days. it is true that manufacturers are dwindling, the whole scope of computer aided design is geared towards universal similarity in design and manufacturing process, so there is less source for funding the magazine, forcing the AMA to drain the coffers to keep it in the mailboxes.
I figure it won't be long before the AMA goes online magazine only.