Well I'd disagree in saying that it hit a brick wall, there was quite a bit of innovation here in the US from the 40's onwards. I can hold many things against capitalism in the United States, but I would say technology has developed fairly rapidly across the entire world. The key distinction, however, is that technology as a national focus shifted from the large scale to the small scale personal/consumer scale. This shift in developmental focus has increased exponentially since the end of the Cold War, which is how we quickly saw the absurdity of the early 00's tech bubble.

Today, we see technological innovation only for the few, the bourgeoisie, higher tech toys and pet projects. Industries that have been known for "innovation" now produce competing copies of each other, all with the goal of fooling consumers into scheduled purchases. Meanwhile, the industries that serve the general public and poorer consumers remain largely unchanged, as Capital fled to software and quick-money tech. These companies are constantly cutting labor, and R&D is a thing of the past. Everything is about market share and distinguishing your product from others, trying to gain enough leverage to have some small monopoly.

Real technological achievement comes at the larger scale for everyone. People obsess about the latest smart-tech that becomes purposefully defunct within a year, while their real lives have remained unchanged or worsened for decades.

Engineering innovation as it is now (and has been since the "end of history" and the collapse of the USSR) is purely focused on separating people from their life in the material world and their community.