You're looking at the impact on everyday life, which has nothing to do with the abstract advancement of technology. Superintelligence only requires continued exponential growth of computing power, which has documented consistency.
https://en.wikipedia.org/wiki/Logistic_function / Sigmoid function's look exponential, but there is no longer a lot of room at the bottom. When things where 10,000 atoms wide dropping that to 1,000 was no big deal yet massive speedup. When they hit 5 atoms wide we what use 0.5 atoms?
PS: Arrays of low power processors like GPU's are still making progress, but we are rapidly approaching the point where there is more than one core per pixel. We might be able to use 1,000 cores per pixel, but I doubt it. EX: At 1080p SLI GTX 1080 Ti = 289 pixel's per CUDA core. Sure, 4/8k will push this off for a while, but monitor resolution has not been going up all that fast.