Technology comes in fits and starts. A lot of new things happened in the 50s and 60s, we are still trying to figure out ways to use and apply them. Just because someone thought about and prototyped something then doesn't mean it's not new when that feature goes mainstream (e.g. garbage collection in Java, channels for concurrency in Go, etc).
For a long time we couldn't break the sound barrier, which is a limit, but not the speed of light limit. Because progress is stalled now doesn't mean there will never be progress in the future.