Yet there are now a lot more incremental advances per year than 200 years ago. Revolutions can only happen only so often. Apart from that, an "average technology" today has on average much more applications than back then, IMHO (convergence, I would call that). And it's adopted faster and is available to more people (=cheaper).

Also, I think that today's breakthroughs have much more prerequisites in humanity's knowledge and capabilities in different fields than 200 years ago.