I'm wary of this kind of reasoning. You could say the same about communism/central-control and totalitarianism but China is still doing fine as a superpower without having to become more open or more democratic.
Religiosity is down, but how long does it take to adapt? Scientology (new strain) is up.
Scientology is up according to what? Their own numbers are pretty suspect.
And when I say religiosity I mean the portion of the population that has no or limited religious affiliation is up as a whole not just one particular denomination or religion, it's down as a whole across all religions.
100 years ago: 0 scientologists
now: conservatively, at least 100 scientologists
As for the portion of the population that has no or limited religious affiliation, I'm not sure that mean it will keep going down, versus comes into some kind of equilibrium.
