I don't think that's true: the changes occurring now are much faster and deeper than the changes that occurred a few generations ago. We're just able to look back at those changes in hind sight and sum up the degrees of change that happened over several decades. Of course that's more extreme than the change that occurs over, say, five years now.
In the last 25 years we went from almost no one having a cell phone to almost everyone in developed countries having them (and a large percentage of those in developing countries as well). The internet was barely visible to most people 25 years ago, now it's a huge part of all our lives.
Worldwide demographic shifts are also extreme, if you look for instance at the number of rural chinese who are moving to the cities.
Advances in healthcare have by no means stopped, and I don't think that purpose-grown organs are far away (just for instance). Look at all the changes that are occurring with drugs that effect our neurobiology. That a person who is depressed can get anti-depressant drugs to deal with that problem is a huge difference from 50 years ago.
Anyway, I'm only saying that technological development, and it's impact on the lives of average people, has not only not slowed but instead accelerated.