The reality of the situation is that it is very hard to live here if you are a foreigner with that kind of job. In the town where I live something like 22 of the 130 or so foreigners who live here are Filipino nurses. I've met some who have stayed for 4-5 years, but most cycle through pretty quickly -- not victims of immigration policy, but more victims of not being able to live and work in Japan without speaking Japanese. My wife used to work at the retirement home nearby and it is a hard job. It is completely unrealistic to bring in foreigners to do it unless they have extensive experience with the Japanese language and Japanese customs.
The same can also be said for other kinds of "cultural" visas. I've only ever met 1 person on a cultural visa and her stay was a disaster. I know some people on the city council and they decided never to do it again.
As for migrant workers... or even non-migrant workers who are willing to farm. I have no idea what the government intends to do, but it's getting desperate out my way. I live in Shizuoka prefecture and we're losing something like 10% of our population every year and nobody wants to farm. I've met a couple from England who got visas to farm here and they have done very well by renting land (which you can get virtually for free). But I agree that something needs to be done.
So, no, it's not nirvana by any stretch of the imagination. But I think the image that people have (fuelled by stories like the one that started this thread) is grossly misaligned with reality.
[0] http://news.abs-cbn.com/overseas/02/03/17/japan-to-extend-st...