I don't think a grass roots movement to ask people to date shorter has any real chance of changing the total height of the population, even if it got traction.

I don't think a grass roots movement to ask people to date shorter has any real chance of changing the total height of the population, even if it got traction. You'd need to directly appeal to tall people to stop having kids. But that would make both the ridiculousness and futility of the approach too apparent.