I share your feeling for the National Geographic of my younger years. but I have to wonder if its decline is really anyone's fault. The cultural space that magazines filled has been so completely occupied and expanded by YouTube, Brilliant, and a host of similar online sources. The clicks lead on and on to a diversity of information that no magazine could possible compete with. Often it's lower quality, but there is endless diversity on any given subject. For younger people, a magazine, no matter how good, seems like a strangely limited version of the Internet. You search in vain for play to type in your queries or hot-link to the next topic or a way to instantly "share" something interesting. I suspect that the drop-off in readership is probably almost exactly parallel to the rate at which subscribers are aging out of the living population.