The Middle East has a guest worker system where migrants can only stay for a few years before returning to their homeland. I can imagine the Japanese implementing something like that, but less harsh.
30k USD annual.
I imagine it will be more of what they already have, such as Filipinos and Indochinese for menial work. Changes might come from where they source higher skilled labour, which will largely come from Europeans fed up with Western societal decline as well as South Americans.
Off-topic but just curious which Hitomi does your username refer to?
The website
As of pre-covid (not sure of exact year), Japan already had a visa "loophole" for skilled labour. Some kind of "foreign liaison" visa that allowed companies to employ white collar workers from South East Asia at approx. 70~80% of local pay. It is ostensibly to support their operations in the region with native language speakers and local cultural knowledge but as my friend (from Indonesia working in Japan) tells me, he and his fellow "imports" do everything and are rarely used for the supposed official purpose.
Dam do they learn Malthusian mathematics at Yale or something, because that some Feudal ass non sense that professor is talking.