I am not an expert, but it seems like most developed countries are learning to deal with a shrinking population. The current decline hasn't had effects like loosening up the job market, so it seems to me this means it's not currently causing any problems that would be catastrophic. There's clearly enough workers for the work that needs to get done.

I think there's not yet been a article of all the 'doom and gloom' of population decline that actually explains why it's worse than overpopulation.