Partner sites could also benefit from some increased subscriber revenue, and ads could actually be relevant again (remember when Scientific American advertisements were kind of cool and industry related?).
Call the prototype deadtreepress.io or something.
(I recognise the environmental implications, but I think paper and postage can be sustainable in some regions. Maybe you could integrate offsets into the price?)
Maybe it could be pdf, I think it may be about some finite amount of content to consume. I guess for me some every 3-12 months ebook with articles that are still relevant and will likely stay relevant for at least a few years would be awesome.
I’m sure plenty of people would want something like this regardless, but the product would usually look much less polished than people expect to see in printed and bound materials and that would reflect on the authors/editors.
Authors and editors who take pride in the presentation of their work might be a hard sell.
BTW, Kindle is pretty successful, and pretty much all books use a standard design template, so the great importance of typesetting & design is questionable.
That said, I've really enjoyed New Scientist. It's not as deep or esoteric as Quanta but still satisfying for a layman like me.