Not true, we've had amazing progress in the last 50 years. They never thought we'd have computers the size of cellphones (or cellphones, for that matter.)
We just haven't had progress in the way they thought we would; Jetpacks were not viable, hoverboards would not work in a movie way, we don't have commercial trips to the moon (why would we all want to go anyway?), and we haven't even set foot on Mars. A computer still can't really pass the Turing test, nor do we have anything close to a humanoid robot that thinks on its own.
Its fun to watch a movie like Blade Runner now, seeing what they got wrong and right. He has a flying car, but has to go up to a payphone to call someone (though it is a "video" phone.)
This might not be my "favorite", but I waited 23 years for it. What took them so long?