I started in this racket in the early '70s, and when I was president of the Science Fiction Writers of America, of which I was like the sixth president, I was the first one nobody ever heard of. ↗
So, I guess the answer to your question is very few people can bring off a novel of the future because it's just so damn hard to make it look like the future. ↗
Somebody's always getting me to come lecture to their writing class, and I don't talk about writing at all, I talk about the business of making a living at this racket. ↗
The Aztecs believe they started up in what's now New Mexico, and wandered for 10,000 years before they got down into where they are now, in Mexico City. That's a weird legend. ↗
You no longer have much in the way of knowing what to do in a big, epic novel about the future, because nobody knows what the hell is going to happen. ↗