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.
In any case I would be very interested in hearing more about a historiography which holds otherwise!
The combustion engine, powered flight, QM, Relativity, modern warfare (including the 2 World Wars that reshaped a lot of the world), commercial refrigeration, widespread use of vaccinations and penicillin, atomic weaponry, and nitrogen for fertilizer are pretty big deals.
The question to ask is which time traveller would have more difficulty understanding the world. The one from 1877 transported to 1947, or the one transported from 1947 to 2017?
And even today, if you take a random poke at Eurasia map, there's an overwhelming chance to end up in the middle of Siberian forest with no cell reception.
The computer age has changed things in a big way, sure, but it's pretty hard to overstate how profoundly many aspects of human life changed in that period.
There was a Planet Money episode recently about this exact topic : http://www.npr.org/sections/money/2017/05/19/529178937/episo...