Well if competitiveness is the reason for low birth rates, this should fix itself once the older generations age out of their posts and the companies need to look for replacements among a much smaller workforce.
Ah but the younger generations will need to support the older non longer working people who also happens to have more votes. Korean national pension is going to run out in 10 years or so, and there is already talk of raising the mandatory contribution from 9% to 18%.