Every time I pick up one of these classic-style science fiction novel, like Ringworld or Double Star, I find myself saying that a) I should read these sorts of books more often, and b) I wish that books like these were still written today.
In philosophy, there is a concept called moral relativism. It was particularly popular in the mid-twentieth century, but has fallen out of favor in many circles today. Aristotle's famous question - "is conduct right because the gods demand it, or do the gods demand it because it is right" - is answered in moral relativism with a resounding no, to both alternatives. Instead, moral relativism asserts that conduct is right so long as it is in keeping with the conventions of the culture within that conduct takes place, and conduct should only be judged within that context.
Science fiction seems to have faded. At least, when I go to a library, or a bookstore, or more likely browse the Amazon Kindle library, I find a lot more good, really original fantasy being put out by new names and in modern times than I do science fiction. I can’t claim to know why this might be, but I do know that it hasn’t always been this way; my dad has often said that when he was younger it was the opposite, with fantasy in a kind of rut, and science fiction the blossoming flower. This present situation is perhaps why I find that I read today much for fantasy than I do science fiction, which is really shame, since every time that I pick up one of these older science fiction novels I invariably enjoy it.