There would need to be a culture shift to becoming somewhere more welcoming to foreigners. Don't get me wrong I had great experiences in South Korea with the younger generation but anyone in their 40s upwards was definitely a mixed bag.

I wouldn't call it hostile but in the workplace it can be difficult to adjust to the work culture there. If they can enact policies around working hours, working rights, health and safety etc they may be able to attract more immigrants to ease the population decline.

They're also suffering similar social financial issues that we're seeing in the west, so that's exacerbating the problem.