I'm looking for books like the title - a realistic but hopeful depiction of the future. Mostly interested in near future, building after the revolution type stuff, but I'd be open to more outright utopian sci-fi as long as the worldbuilding was interesting.
Not quite what you're asking for, but it is kind of fun to read Red Star by Bogdanov. Basically a Bolshevik using a fictional Martian society as a way to project what he thought a post-revolution full-communist society would look like.