Sure, theoretical investigations on things begin many years earlier than anyone starts actually using them, but somehow "concurrency" wasn't something available to your everyday Joe back in 60s, right? Multi-core wasn't the norm, there was no elastic cloud, what so on.
And I am not really claiming that software development changed much in 3 years, but I think people's mindsets are changing faster than that, especially of those who are actively involved in thinking about these things.