In the late 1960s, the Boeing 747 and the Boeing 737 flew. The Concorde was flying. The X-15 had flown. There were many experimental transonic aircraft. Men had landed on the moon, even.
Even the flying car looked close. There were lots of VTOL aircraft in the 1950s and 1960s. Small helicopters like the UH-1 were working well for the military.
Then, suddenly, it was over. The last 50 years of aviation have produced fewer innovations than any single decade in the previous 50 years. Versions of the B-737 and B-747 are still in production. The Concorde was retired and not replaced. As Scott Crossman, the test pilot, once said, everything that ever flew substantially faster than Mach 3 is now in a museum. No one has been beyond low earth orbit since the early 1970s. If you want to see the VTOLs of the 1950s and 1960s, they're in the Hiller Aviation Museum in San Carlos. Aviation hit the limits of what you can do by burning fuel. In the early 1970s, the aerospace industry had huge layoffs as the space program wound down and not much was happening in aviation.
Computing may be there. Clock rates for mainstream CPUs have been in the 3-4 GHZ range for a decade now. That never happened before. We've hit fundamental limits. Atoms are too big. Line widths are measured in atom counts now. Electrons are too big. The number of electrons in a flash memory cell is in two digits. Photons are too big. Optical lithography has had to go to soft X-rays ("extreme ultraviolet") to get better resolution, using an insanely complicated technology that just barely works. Fabs cost way too much and there are fewer leading-edge ones. Moore's Law is over.
As with aircraft, computing may shift to doing slightly better within the limitations of the physics we've got. The happy time of better hardware every year is over.