That's funny, considering how often Sci-fi is the genre that breaks through with revolutionary ideas about previously unimagined futures.

It'll come back once enough people start having newer ideas of the future, it's hard to do sci-fi when technology keeps catching up (Heck, look at drones and smart phones... How many years back do you have to go for those to be purely sci-fi? ~25, if I had to guess.)

But given how other mediums have been doing sci-fi, Like the Expanse series, I think it's only a matter of time for some new ideas to appear in anime.