> Technology advances rapidly and affects us all, with new products and production methods replacing old ones in a never-ending cycle. This is the basis for sustained economic growth

since the end of the 19th century...

Am I missing something?

How can they assert that the current trajectory of economic growth won't end in stagnation, like every other growth spurt throughout history?

Sure, the economic growth of the last 150 years is unprecedented in history. But so was the second most significant period of economic growth before it stagnated.