I don't think you're looking ahead far enough. It's true that people's attention spans have declined, but I can't imagine that is a permanent condition. Giving sustained attention to interesting things is an essential feature of human minds, and I'm certain we'll regain that ability over time. I see signs of it even now. And when you say, "…current magazines are really bad and vapid and cheap," you're describing the unsuccessful response by many publications to pressure from digital media: they cut quality. A resurgence of magazines will require that they recognize that error and correct it, publishing magazines that show depth of thought and quality writing and printing — all the things that are discouraged by the "quantity first" attitude of digital media. I think the time for a resurgence of print periodicals is coming soon.