Don't threaten people with a good time.
For all the economic problem Japan has, most would pick Tokyo over the economic *and* migration problems the likes of London and Paris have.
Better robots than third world for that economic necessity.
In fact if it was about economics primarily, the migrants would have little in the way of rights and benefits, Gulf State migration style, and would be strictly controlled so that they actually work and get severely punished for causing any trouble, or just for the hell of it to pay them even less. That massive policy change would cut the western opposition to mass migration by half, if not more. If it's about economics, why doesn't any western country with mass migration do that? If even Arabs can figure out how to do economic migration cheaply and effectively, why are we worse?
Yes, the guy complaining about the "The far right ranting about race mixing and "they took our jerbs" strawman in fact does sound leftist. The left is crazy about dunking on "far right" like that all the time.