The thing to remember about Asimov is that he was a trained scientist who spent a lot of time writing about science (the real stuff, not just the fictional stuff). As such, he had a very good idea of what was possible technologically and where research was heading.

He did get some things wrong. Predicting how society will respond to technology is always a risky business, and it is impossible to predict unexpected discoveries. Research interests will also change with time. That makes long range predictions risky and short range predictions safer, but that is mostly a generational thing. But when all is said and done, he did have a better chance at accurately predicting the future than wishful thinkers.