We might simply be a society in decline. Bureaucracy, Idiocracy, Cleotocracy all effect productivity negatively - and they're all present to various degrees around the world.

We have bullshit jobs, virtual economies, ideological education, inept politicians, and a shrinking IQ. So what else is supposed to happen to productivity.

The only possible improvement is in energy, where the incredible cheapness of PV and battery storage might massively drive down energy prices over the next decades. But even then, it's notably not the complex and marvelous nuclear power that would save the day, but a cheap mass-produced good made mostly from sand.